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RV Water Tanks

3d renders of boat and rv tanks

Fresh water tanks for RVs, campers and trailers

RV fresh water tanks from Custom Roto-Molding, Ronco and Trionic, 3 to 260 gallons. Each is rotomolded from polyethylene as one seamless piece, built for years of road vibration and rough terrain. Use them to replace a cracked tank or to fit out a new coach, trailer or van conversion; Trionic tanks can also serve as holding tanks. Replacing a tank? Start with our RV Tanks guide to match size and fittings.

Size comes down to space and use: measure the length, width and height available, check where the fill, vent and outlet need to sit, then pick the capacity that fits; the RV fresh water tank guide lists what to measure. Fitting kits are in RV and marine tank accessories; for waste water, see RV holding tanks.

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Guides for RV Water Tanks

How to choose an RV fresh water tank

  1. Check you are in the right group. Fresh water tanks for boats are in marine water tanks, and RV & marine tanks shows every group side by side, including holding tanks and accessories.
  2. Pick a size band. Compact tanks include the 4, 7 and 9 gallon RV fresh water tanks, mid sizes include 25, 32 and 45 gallons, and large tanks run from 100 gallons up to 260 gallons. More water takes a bigger footprint, so the space you have sets the band.
  3. Compare models within a size. One capacity often comes as several Custom Roto-Molding models. The 100 gallon size alone is listed as W-101, W-221, W-229, W-325, W-348 and W-462, so compare each model's length, width and height with your bay before you choose.

RV fresh water tank questions

What is the largest RV fresh water tank? The range tops out at 260 gallons. Tanks above 100 gallons include the 105, 125 and 141 gallon RV fresh water tanks and the 142 and 145 gallon tanks from Custom Roto-Molding. A large tank needs a long, wide bay, so measure before you pick one.

How do I find a replacement RV fresh water tank? Start with the old tank's model code if you know it. Custom Roto-Molding RV water tanks use W codes, and some small ones use L codes, such as the 10 gallon L-1 and 15 gallon L-3. Without a code, match the old tank's length, width, height and opening positions.

Why are some tanks called Marine & RV Tank? The name marks a tank meant for both boats and RVs. These models sit in this group in sizes such as 10, 36, 100 and 130 gallons, so compare them with the other RV tanks of the same capacity.

Is a fresh water tank the same as a holding tank? No. A fresh water tank holds clean water for use on board, while waste water goes in RV holding tanks. The exception is Trionic: its tanks in this group can also serve as holding tanks.

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