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Marine and RV Water and Holding Tanks for Sale

Pick the size, the shape, and the fitting locations to make a perfect fit for your Marine or RV Water and Holding Tank replacement.   You won’t find better-made RV or Marine holding tanks for the price.

Made from one piece to form 3/8"; thick walls using a roto-mold process to create a seamless holding tank superior in strength and performance. The bottom line: These tanks are nearly unbreakable and are built to go the distance, at sea or on the road.

Fittings: You customize the placement of the fittings when you place the order. We spin-weld the fittings to ensure your holding tank is securely connected to your plumbing.

  • Complies with NSF 61, FDA Reg CFR 177.1520, and Coast Guard Standards
  • Made from virgin polyethylene (poly) resins
  • Seamless tank made from one piece (less likely to break or leak)
  • 3/8” thick tank walls
  • Customized fitting placement
  • Spin weld fittings
  • Outlasts the competition

For use as RV freshwater tanks, RV holding tanks, RV black water holding tanks, RV waste holding tanks, Marine fresh water tanks, Marine holding tanks, and more!

We have 100's of sizes ranging from 2 gallons, 40 gallons, 50 gallons, 100 gallons, up to 250 gallons for these marine and rv fresh water and holding tanks.

  • Marine Holding Tanks
  • Marine Water Tanks
  • RV holding Tanks
  • RV Water Tanks
  • RV Black Water Tanks

RV & Marine Tanks

  • An image of a 22 Gallon Marine Holding Tank | B463

    48 Gallon Marine Holding Tank | B384

    Introducing the 48 Gallon Marine Holding Tank by One Clarion. This portable tank is designed specifically for marine use, making it the perfect solution for boat owners. With its rectangular shape, it fits easily into tight spaces and can be conveniently...

    $550.32
    Add to Cart
  • An image of a 3 Gallon Marine Fresh Water Tank | BOAT13W

    48 Gallon Marine Fresh Water Tank | B306

    Upgrade your marine vessel with the 48 Gallon Marine Fresh Water Tank from One Clarion. This rectangular tank is designed for portable use and is suitable for above ground environments. Made from polyethylene in a natural white color, this tank measures...

    $491.07
    Add to Cart
  • An image of a 3 Gallon Marine Holding Tank | BOAT13W

    48 Gallon Marine Holding Tank | B306

    Introducing the 48 Gallon Marine Holding Tank by One Clarion. This portable tank is designed specifically for marine use, making it the perfect solution for boat owners. With its rectangular shape, it fits easily into tight spaces and can be conveniently...

    $491.07
    Add to Cart
  • An image of a 47 Gallon Marine Fresh Water Tank | B507

    48 Gallon Marine Fresh Water Tank | B293

    Introducing the 48 Gallon Marine Fresh Water Tank by One Clarion. This portable tank is designed specifically for marine use, making it the perfect solution for your fresh water needs while out on the water. With a rectangular shape and a capacity of 48...

    $573.42
    Add to Cart
  • An image of a 47 Gallon Marine Holding Tank | B507

    48 Gallon Marine Holding Tank | B293

    Introducing the 48 Gallon Marine Holding Tank by One Clarion. This portable tank is designed specifically for marine use, making it the perfect solution for boat owners. With its rectangular shape and above ground usability, this tank is easy to...

    $573.42
    Add to Cart
  • An image of a 20 Gallon RV Holding Tank | RV24H

    48 Gallon Marine Fresh Water Tank | B229

    Introducing the 48 Gallon Marine Fresh Water Tank by One Clarion. This portable tank is specifically designed for marine use, making it perfect for boating and other water activities. With its rectangular shape, it is easy to fit into tight spaces on...

    $491.07
    Add to Cart
  • An image of a 11 Gallon RV Fresh Water Tank | RV23W

    48 Gallon Marine Holding Tank | B229

    Introducing the 48 Gallon Marine Holding Tank by One Clarion. This portable tank is designed specifically for marine use, with a rectangular shape that allows for easy storage and transportation. Made from durable polyethylene material, this tank is...

    $491.07
    Add to Cart
  • 48 Gallon RV Water Tank W-514. Technical drawing of a polyethylene water tank designed for your rv.

    48 Gallon RV Water Tank W-514

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 48 Gallon RV Water Tank, Part# W-514, is engineered to meet the requirements of mobile water...

    MSRP: $414.71
    $394.29
    Add to Cart
  • 48 Gallon RV Water Tank W-445. Technical drawing of a polyethylene water tank designed for your rv.

    48 Gallon RV Water Tank W-445

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 48 Gallon RV Water Tank, Part# W-445, is engineered to meet the requirements of mobile water...

    MSRP: $349.91
    $332.68
    Add to Cart
  • 48 Gallon RV Water Tank W-319. Technical drawing of a polyethylene water tank designed for your rv.

    48 Gallon RV Water Tank W-319

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 48 Gallon RV Water Tank, Part# W-319, is engineered to meet the requirements of mobile water...

    MSRP: $285.11
    $271.08
    Add to Cart
  • 48 Gallon RV Water Tank W-279. Technical drawing of a polyethylene water tank designed for your rv.

    48 Gallon RV Water Tank W-279

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 48 Gallon RV Water Tank, Part# W-279, is engineered to meet the requirements of mobile water...

    MSRP: $311.03
    $295.72
    Add to Cart
  • 48 Gallon Marine Water Tank MW-79. Technical drawing of a polyethylene water tank designed for marine vessels.

    48 Gallon Marine Water Tank MW-79

    This tank ships in 6-8 weeks. Custom fitting placement is not available at this time. It can be ordered blank, or blank with a DIY Fitting Kit Custom Roto-Mold 48 Gallon Marine Water Tank, Part# MW-79, is engineered to meet the requirements of mobile...

    MSRP: $406.31
    $386.31
    Add to Cart