Custom RV Water Tanks

Choose the Size, Shape & Fitting Placement

white mrine fresh water tank with orange capsFor custom RV water tanks, RV freshwater tanks, and holding tanks of any size, One Clarion has the answer you need (see charts below for available sizes and dimensions). When it comes to top-notch quality and exceptional performance, look no further.

Custom RV water tanks are meticulously crafted using FDA-approved virgin polyethylene plastic resins, making them the perfect choice for a wide range of applications, including RV freshwater tanks, RV holding tanks, marine boat tanks, graywater tanks, ballast tanks, and more. Experience peace of mind with the RV Freshwater tanks. Designed for strength and durability, they provide the longest lasting tanks on the market. Constructed as one solid piece, our tanks are thick, seamless, and free from any concerns about contamination or leakage. With a long-lasting build, our tanks are engineered to withstand the test of time. For a perfect fit and secure connection, we offer customization options for dimensions and incorporate spin-weld fittings.


Meets Safe Drinking Water Standards

Our RV freshwater tanks meet the requirements set by FDA regulation CFR 177.1520 and adhere to Coast Guard Standards, rendering them highly suitable for storing drinking/potable water. Designed with fully enclosed walls that are 3/8" thick, our tanks provide outstanding durability and an extended lifespan, protecting your water supply from contaminants. If your project requires customized sizes or shapes, our dedicated team is prepared to help you discover the perfect tank that aligns with your particular requirements.

RV Tanks
Bow Shaped Water Tanks

dump waste tank drawing
Part No. Capacity Length Width Depth Drawings
W-367 8 19.5 13.5 7.5 drawing (pdf)
W-370 12 24 15 10 drawing (pdf)
W-415 13 22 19.5 14.75 drawing (pdf)
W-366 15 36 13.5 7.5 drawing (pdf)
W-361 16 15 25.25 13 drawing (pdf)
W-446 18 41 25.5 16 ask for details
W-428 20 23 16.5 15.5 ask for details
W-449 20 34.5 21.1875 11.75 ask for details
W-413 21 34 15 10.75 drawing (pdf)
W-414 22 24 21.25 15.25 drawing (pdf)
W-460 23 21.5 34.5 12 ask for details
W-365 25 59 13.5 7.5 drawing (pdf)
W-421 30 31 18 16 drawing (pdf)
W-464 34 31 30 12 drawing (pdf)
W-412 35 34 29.5 9 drawing (pdf)
W-363 35 66 15.5 9.75 drawing (pdf)
W-359 56 90 17.5 12 drawing (pdf)
W-360 56 90 17.5 12 drawing (pdf)

Camper Fresh Water Tanks
L Shaped Water Tanks

end dump holding tank drawing
Part No. Capacity Length Width Depth Drawings
W-14 7 17 9.5 19 ask for details
W-283 31 54 9 13.5 ask for details
W-278 31 96 19 8 ask for details
W-377 32 44 18 14.25 ask for details
W-432 32 45 18 10.5 ask for details
W-311 35 52 38 4.5 ask for details
W-454 36 108 14.5 5.75 ask for details
W-346 38 81 35 6 ask for details
W-286 39 59 36 4.5 ask for details
W-252 40 45.5 15.5 18 ask for details
W-290 40 51 25.5 9 ask for details
W-269 40 53 24 9 ask for details
W-43 40 70 21 12.75 ask for details
W-458 40 87 24.5 8.75 ask for details
W-253 50 54 36 9 ask for details
W-39 50 71 17.25 12.25 ask for details
W-419 92 53 36.5 13.5 ask for details
W-385 93 39 36 20 ask for details
W-219 100 65 22.75 22 ask for details
W-436 100 76 62 8.5 ask for details




Rectangle Shaped RV Water Tanks

rectangular shape tank
Part No. Capacity Length Width Depth Drawings
W-364 2 gallons 9.75 9.75 6 drawing (pdf)
W-49 3 gallons 16 7.5 6.5 drawing (pdf)
W-77 5 gallons 15.5 15.5 5 drawing (pdf)
W-369 6 gallons 16 12 8 ask for details
W-354 6 gallons 17 12 8 drawing (pdf)
W-26 8 gallons 19.25 13 9.5 drawing (pdf)
W-306 8 gallons 36 16 4 ask for details
W-376 8 gallons 54 6 7 ask for details
W-245 9 gallons 17.625 15.625 8.25 ask for details
L-1 10 gallons 18 16 8 drawing (pdf)
W-53 10 gallons 24 14.5 7.5 drawing (pdf)
W-210 10 gallons 24 15.5 8 drawing (pdf)
W-33 10 gallons 31 15.5 6 drawing (pdf)
W-294 10 gallons 40 25 9.25 drawing (pdf)
L-2 12 gallons 24 16 8 drawing (pdf)
W-28 13 gallons 30 14 8.25 drawing (pdf)
W-355 15 gallons 17.75 14.75 14.75 drawing (pdf)
W-27 15 gallons 22.25 13 13 drawing (pdf)
W-327 15 gallons 23 16 11 drawing (pdf)
L-3 15 gallons 30 16 8 drawing (pdf)
W-97 15 gallons 33 21.5 5.75 ask for details
W-328 15 gallons 48.5 10.75 7.875 drawing (pdf)
W-282 16 gallons 30.125 17.25 8 drawing (pdf)
W-209 19 gallons 36 15.5 8 drawing (pdf)
W-51 20 gallons 21 17 14 drawing (pdf)
W-80 20 gallons 24 17.75 12 drawing (pdf)
W-368 20 gallons 24.5 15.5 13.5 drawing (pdf)
W-95 20 gallons 30 18 9 drawing (pdf)
W-81 20 gallons 33.25 17.25 8.75 drawing (pdf)
L-4 20 gallons 36 16 8 drawing (pdf)
W-320 21 gallons 21 21 12.5 drawing (pdf)
W-371 21 gallons 29 20 9 drawing (pdf)
W-268 22 gallons 35 14 12 ask for details
W-304 25 gallons 25 21 12 drawing (pdf)
W-45 25 gallons 27 20 12 drawing (pdf)
W-85 25 gallons 34 17.5 11 drawing (pdf)
W-20 25 gallons 42 16 10 ask for details
L-5 25 gallons 48 16 8 drawing (pdf)
W-201 25 gallons 52.5 12 10.75 drawing (pdf)
W-31 27 gallons 21 18 18 drawing (pdf)
W-2 27 gallons 35 15 13 drawing (pdf)
W-335 27 gallons 42.5 17.5 9 drawing (pdf)
W-285 27 gallons 44 17 9 drawing (pdf)
W-225 28 gallons 34.25 17.5 12 ask for details
W-207 28 gallons 35.25 15 13 drawing (pdf)
W-55 28 gallons 52 12 11 drawing (pdf)
W-323 29 gallons 25 24 12 drawing (pdf)
W-244 30 gallons 29.75 25.75 9.5 drawing (pdf)
W-30 30 gallons 32 20 12 drawing (pdf)
W-254 30 gallons 33 20 11 drawing (pdf)
W-292 30 gallons 34.5 18 12 drawing (pdf)
W-233 30 gallons 35.5 19 10.75 drawing (pdf)
W-32 30 gallons 42 28 6.5 drawing (pdf)
W-280 30 gallons 44 14 12 drawing (pdf)
W-338 30 gallons 45.5 22 7.75 drawing (pdf)
W-236 32 gallons 50.5 20 8 ask for details)
W-373 32 gallons 64 24 5.25 drawing (pdf)
W-237 33 gallons 30 16 16 drawing (pdf)
W-332 33 gallons 42 21.5 9 drawing (pdf)
W-234 34 gallons 48 21 8 drawing (pdf)
W-22 35 gallons 31.5 19.5 14.75 drawing (pdf)
W-316 35 gallons 33 28 9 ask for details
W-202 35 gallons 37 20 12 drawing (pdf)
W-75 35 gallons 69 11 11 drawing (pdf)
W-324 38 gallons 41.5 17.75 12.5 ask for details
W-266 38 gallons 47 17 12.125 ask for details
W-3 38 gallons 48.5 14 13 drawing (pdf)
W-205 38 gallons 58.5 16.125 10 drawing (pdf)
W-227 38 gallons 71.5 13 10 drawing (pdf)
W-259 39 gallons 28.375 18 17.5 drawing (pdf)
W-257 39 gallons 55 28 6.25 drawing (pdf)
W-248 40 gallons 31 26 11.75 drawing (pdf)
W-291 40 gallons 31.75 28 11.25 drawing (pdf)
W-307 40 gallons 33 22.5 13.5 ask for details
W-293 40 gallons 34 16 17 drawing (pdf)
W-313 40 gallons 38 25 11 ask for details
W-17 40 gallons 41 15.25 15.5 ask for details
W-284 40 gallons 41 21 11 drawing (pdf)
W-296 40 gallons 41 21 11 drawing (pdf)
W-204 40 gallons 42.25 27 9.5 drawing (pdf)
W-96 40 gallons 54 20 9 ask for details
W-295 40 gallons 54 23.5 8 drawing (pdf)
W-1 40 gallons 58 14 12 drawing (pdf)
W-226 40 gallons 58 21 8 ask for details
W-270 40 gallons 60 18 9.375 drawing (pdf)
W-314 40 gallons 60 18 9.375 ask for details
W-231 41 gallons 50 19 10 drawing (pdf)
W-48 41 gallons 60 28 6 drawing (pdf)
W-380 43 gallons 99 13.75 7.5 ask for details
W-250 44 gallons 38 17 16 drawing (pdf)
W-38 44 gallons 42 26.5 9.5 ask for details
W-309 44 gallons 60 31 5.75 ask for details
W-24 45 gallons 40 19 16 drawing (pdf)
W-35 45 gallons 42 20 13 ask for details
W-25 45 gallons 48 28 8 drawing (pdf)
W-264 45 gallons 64 24 7.5 drawing (pdf)
W-79 47 gallons 48 19.75 12 drawing (pdf)
W-279 48 gallons 72 20 8 drawing (pdf)
W-249 50 gallons 26 21.5 21 drawing (pdf)
W-275 50 gallons 45 26 10 ask for details
W-289 50 gallons 48 18 14.5 drawing (pdf)
W-318 50 gallons 51 28 8.375 ask for details
W-330 50 gallons 54.75 27 8 drawing (pdf)
W-208 50 gallons 57 36 6 drawing (pdf)
W-228 50 gallons 64 32 6 drawing (pdf)
W-271 50 gallons 68 13.5 13.5 drawing (pdf)
W-212 52 gallons 58 24 9 drawing (pdf)
W-12 53 gallons 30.25 24.5 17.25 ask for details
W-305 54 gallons 55 28 8.375 drawing (pdf)
W-403 55 gallons 45 23 12.75 ask for details
W-302 55 gallons 51 21 13 drawing (pdf)
W-4 55 gallons 60 20.5 11 drawing (pdf)
W-76 57 gallons 48 24 12 drawing (pdf)
W-300 60 gallons 48 21.5 14.5 drawing (pdf)
W-74 60 gallons 50 18 16 drawing (pdf)
W-276 60 gallons 53.5 21 13 drawing (pdf)
W-277 60 gallons 57 28 9 drawing (pdf)
W-37 60 gallons 70 26 8 ask for details
W-59 60 gallons 79.25 15.75 11.5 drawing (pdf)
W-331 62 gallons 50 32 9 drawing (pdf)
W-223 65 gallons 34 24 18.5 ask for details
W-362 65 gallons 39.75 23.75 16.25 drawing (pdf)
W-241 65 gallons 60 22 11.5 drawing (pdf)
W-220 68 gallons 42.5 39 9.5 drawing (pdf)
W-84 68 gallons 48.5 26 13 drawing (pdf)
W-213 72 gallons 34.5 23 21.5 drawing (pdf)
W-34 74 gallons 65 20.75 13 drawing (pdf)
W-251 80 gallons 59 49.5 7 drawing (pdf)
W-315 93 gallons 71 27 11.5 ask for details
W-218 95 gallons 41 25.25 22 drawing (pdf)
W-230 97 gallons 67 48 7 drawing (pdf)
W-214 98 gallons 52 26 17 drawing (pdf)
W-221 100 gallons 36 27.5 23.5 drawing (pdf)
W-101 100 gallons 50 40 12 drawing (pdf)
W-68 103 gallons 59.25 23.625 17.75 ask for details
W-63 105 gallons 46.5 33 16 drawing (pdf)
W-88 105 gallons 48 24 21.5 drawing (pdf)
W-60 105 gallons 79.25 27 11.5 drawing (pdf)
W-310 105 gallons 92 27.5 10 ask for details
W-308 107 gallons 94 27 9.75 ask for details
W-238 128 gallons 64.5 40 11.5 ask for details
W-347 132 gallons 65 38 12.5 drawing (pdf)
W-239 140 gallons 64.5 43.5 11.5 drawing (pdf)
W-272 142 gallons 60 43 13.75 drawing (pdf)
W-108 145 gallons 50 31.25 22 drawing (pdf)
W-69 145 gallons 69.75 44 11 ask for details
W-56 160 gallons 64.75 43 13.75 drawing (pdf)
W-345 163 gallons 65 30.5 19.25 drawing (pdf)
W-372 188 gallons 62 40 17.5 drawing (pdf)

RV Tanks
Water Tank with Rails

l shaped end dump tank drawing
Part No. Capacity Length Width Depth Drawing
W-78 25 47 22.625 6.5 ask for details
W-357 30 46.25 31.5 6 ask for details
W-235 30 54 22 6.5 ask for details
W-247 38 45 22 10.5 ask for details
W-356 40 57 35 6 ask for details
W-206 40 60.5 20.75 8.5 ask for details
W-336 45 56 30 7.75 drawing (pdf)
W-434 50 57 35 6.5 ask for details
W-342 52 58 31 7 ask for details
W-301 53 60 39.5 5.5 ask for details
W-337 54 54.5 28.5 9 ask for details
W-216 55 67 32 7 ask for details
W-232 57 56.625 28.5 9 ask for details
W-333 57 57 28.5 9 ask for details
W-334 66 42.5 39 10 ask for details
W-341 72 60 53 5.5 ask for details
W-340 90 60 52.5 7 ask for details
W-439 97 57 39.5 11 ask for details
W-348 100 65 39.5 9.875 ask for details
W-352 105 60 39.5 11 ask for details


RV Tanks
Wedge Shaped Water Tanks

l shaped side dump holding tank drawing
Part No. Capacity Length Width Depth Drawing
W-358 8 gallons 19.75 17.75 8 drawing (pdf)
W-375 17 gallons 24.5 22 9 drawing (pdf)
W-274 65 gallons 69 24.25 10.75 ask for details
W-273 70 gallons 73.75 24.25 10.75 ask for details
W-211 72 gallons 61.75 24 13 drawing (pdf)
W-281 81 gallons 70 26.75 11.75 drawing (pdf)
W-349 82 gallons 48 40.5 11 ask for details
W-224 88 gallons 73.75 24.25 12.75 ask for details
W-353 93 gallons 59 36.5 11.375 drawing (pdf)
W-303 97 gallons 73 24.75 14 drawing (pdf)
W-215 100 gallons 78 26 14 drawing (pdf)
W-99 105 gallons 60 40.5 11.5 ask for details
W-374 107 gallons 76 38.5 10.125 ask for details
W-350 108 gallons 76 40 10 ask for details
W-378 110 gallons 57 32 16 ask for details
W-93 150 gallons 67.5 40.5 14.25 drawing (pdf)




Poly RV Holding Tanks - Unmatched Quality and Functionality

Explore our outstanding range of RV holding tanks, including custom RV water tanks, that are meticulously designed to meet your exact requirements. Crafted with premium polyethylene plastic resin that is FDA-approved, our tanks guarantee the safety of your drinking water. Whether it's for your RV, boat, or any marine vessel, our tanks offer unparalleled quality and functionality.

Seamless Integration and Efficiency

rotomolding process graphicOne of the key features of our custom water tanks is their remarkable strength and durability. Built with a one-piece roto-molded design, our tanks are exceptionally sturdy, preventing cracks and leaks. With female NPT openings, our tanks seamlessly integrate into your RV plumbing system, providing hassle-free installation. We prioritize efficiency and waste reduction by incorporating spin weld fittings, ensuring a precise and leak-free fit for your tank.

Why does a Seamless Tank matter?

Overall, a seamless tank provides superior durability, leak resistance, hygiene, and ease of maintenance compared to tanks with seams. It offers a more reliable and long-lasting solution for storing liquids, such as water, in various applications, including RVs, boats, and other vessels.

  1. Enhanced Durability: A seamless tank, typically manufactured through a roto-molding process, eliminates the need for seams or joints. This design feature ensures that there are no weak points where leaks or cracks could occur over time. As a result, the tank is more durable and less prone to structural failures.

  2. Leak Prevention: The absence of seams greatly reduces the risk of leaks. With traditional tanks that have seams, there is always a possibility of those seams deteriorating or becoming compromised over time, potentially leading to leaks and water damage. A seamless tank eliminates this concern and provides added peace of mind.

  3. Improved Hygiene: Seams in a tank can create crevices or hard-to-reach areas where bacteria, mold, or other contaminants can accumulate. A seamless tank eliminates these potential breeding grounds for pathogens, making it easier to clean and maintain proper hygiene standards.

  4. Easy Cleaning and Maintenance: Without seams, a seamless tank offers a smooth and uniform interior surface. This facilitates easier cleaning and maintenance since there are no crevices or corners where debris can accumulate. It allows for thorough cleaning and disinfection, ensuring the water stored inside remains clean and safe for use.

  5. Longevity: The absence of seams in a tank contributes to its overall longevity. Since there are no weak points that are susceptible to deterioration or failure, a seamless tank is likely to have a longer service life. It can withstand environmental stresses and regular usage without the risk of structural degradation.

*Mounting straps are not included with this tank, and it is not for use with gasoline fuel storage. If you need a different type of tank, our team can help you find the right custom tank to fit your specific needs.

Ordering Process Made Easy

Recognizing the uniqueness of every RV, we provide the flexibility to design and fabricate a custom RV water tank that perfectly aligns with your specific requirements. With no pre-drilled holes restricting your choices, you have the liberty to determine the placement of holes and fittings on your tank, ensuring an ideal fit for your space and preferences.

To get started, follow this simple step-by-step guide:

  1. Complete a tank drawing that accurately represents the dimensions and desired features of your tank. Specify the desired port locations on the drawing. Submit your drawing via the contact form or email, and we will promptly respond to your inquiry.

  2. Our dedicated team will thoroughly review your drawing and reach out to you for further discussion. We will offer valuable feedback and suggestions to optimize your design for maximum functionality.

  3. We will collaborate closely with you until you are fully satisfied with the final design. Once approved, we will promptly process your order, ensuring a seamless experience from start to finish.

  4. For precise fulfillment of your requirements, it is highly recommended to provide detailed information regarding the sizes and locations of your tank components. If you have any uncertainties or require adjustments, our team is readily available to assist you throughout the process.

*Please note that mounting straps are not included with this tank, and it is not suitable for storing gasoline fuel.

If you need a different type of tank, our team is well-equipped to help you discover the perfect custom solution that meets your specific needs. Embrace the convenience and reliability of a custom-designed RV water tank today. Allow us to bring your vision to life and provide a superior water storage solution tailored exclusively for you.

Accessories

At One Clarion, we understand the importance of customizing your RV experience to match your unique needs. From spin-weld fittings to versatile storage compartments and battery boxes, we have everything you need.

white fitting

Spin-Weld Fittings for Holding and Fresh Water Tanks
With the utilization of advanced spin welding technology, this innovative process ensures the formation of robust and long-lasting permanent joints that are entirely leak-proof and highly resistant to breakage. The fittings are meticulously crafted to match your individual tanks, ensuring a secure and precise connection that will endure for years to come.





compartment drawing

Versatile Compartments
Optimize the storage capacity of your RV by utilizing our diverse selection of compartments. We offer rounded corner open-ended, square corner open-ended, and square corner top and end compartments in a range of sizes. These compartments are carefully crafted to offer convenient storage solutions, enabling efficient organization of your belongings. Discover our extensive assortment of sizes and shapes to discover the ideal compartments that perfectly meet your requirements.

See list of available shapes and sizes.


battery box drawing

Battery Boxes for Protection
Safeguard your marine battery against tipping, accidental short-circuits, and corrosion by utilizing our assortment of battery boxes. These robust boxes not only provide a secure enclosure for your battery but also offer protection against potential harm. Explore our range of available battery box sizes to discover the ideal match for your marine battery, ensuring a perfect fit and reliable defense.

  • Battery Box GRP-31-S
  • Double Battery Box End X End GRP-31-DE
  • Double Battery Box Side X Side GRP-31-DS
  • Optima Battery Box GRP-34-SO

Sustainable Custom Plastic Water Storage Solutions

 eco-friendly logo

At One Clarion, we prioritize sustainability. These custom plastic RV tanks offer an environmentally friendly solution for water storage. Manufactured with non-toxic materials, our tanks contribute to low carbon emissions throughout their life cycle. Built to withstand corrosion, leak-proof, and resistant to UV damage, our tanks outlast others in longevity and durability. By choosing our flexible and cost-effective custom RV water tanks, you actively reduce your carbon footprint while enjoying reliable water storage.

Experience the Difference with One Clarion

No matter what size or shape, we have strong, dependable RV water tanks that will get the job done. These tanks are built to last, and are priced to sell. See for yourself and call us!


Products Customers Also Viewed

rotomolded tanks drawing a copuple sitting in front of a camper parked rv
Custom Rotomolded Tanks Camper Black Water Tanks RV Water Tanks