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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

  • 135 Gallon Marine Water Tank MW-239. Technical drawing of a polyethylene water tank designed for marine vessels.

    135 Gallon Marine Water Tank MW-239

    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 135 Gallon Marine Water Tank, Part# MW-239, is engineered to meet the requirements of mobile...

    MSRP: $1,226.50
    $1,166.11
    Add to Cart
  • 135 Gallon RV Holding Tank H-313 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    135 Gallon RV Holding Tank H-313

    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 135 Gallon RV Holding Tank, Part# H-313, is engineered to meet the requirements of mobile...

    MSRP: $686.85
    $653.04
    Add to Cart
  • 136 Gallon RV Holding Tank H-673. Technical drawing of a polyethylene holding tank designed for your rv and camper.

    136 Gallon RV Holding Tank H-673

    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 136 Gallon RV Holding Tank, Part# H-673, is engineered to meet the requirements of mobile...

    MSRP: $997.88
    $948.75
    Add to Cart
  • An image of a 13 Gallon RV Fresh Water Tank | RVB266

    141 Gallon RV Fresh Water Tank | B484

    The 141 Gallon RV Fresh Water Tank from One Clarion is a rectangular, portable tank designed for above ground use. Made from polyethylene in a natural white color, this tank measures 53" in length, 35" in width, and 19" in height. It is not designed for...

    $900.81
    Add to Cart
  • An image of a 14 Gallon RV Fresh Water Tank | RVB265

    141 Gallon Marine Fresh Water Tank | B484

    The 141 Gallon Marine Fresh Water Tank by One Clarion is a rectangular-shaped portable tank designed for above ground use. This tank is made of polyethylene material in a natural white color, measuring 53 inches in length, 35 inches in width, and 19...

    $900.81
    Add to Cart
  • An image of a 15 Gallon RV Fresh Water Tank | RVB264

    141 Gallon Marine Holding Tank | B484

    The 141 Gallon Marine Holding Tank by One Clarion is a rectangular-shaped tank that is designed for portable use in above ground environments. This tank is made from high-quality polyethylene material and comes in a sleek black color. It is not designed...

    $900.81
    Add to Cart
  • 142 Gallon RV Water Tank W-474. Technical drawing of a polyethylene water tank designed for your rv.

    142 Gallon RV Water Tank W-474

    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 142 Gallon RV Water Tank, Part# W-474, is engineered to meet the requirements of mobile water...

    MSRP: $1,166.35
    $1,108.93
    Add to Cart
  • 142 Gallon RV Water Tank W-272. Technical drawing of a polyethylene water tank designed for your rv.

    142 Gallon RV Water Tank W-272

    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 142 Gallon RV Water Tank, Part# W-272, is engineered to meet the requirements of mobile water...

    MSRP: $557.26
    $529.82
    Add to Cart
  • 142 Gallon Marine Water Tank MW-474. Technical drawing of a polyethylene water tank designed for marine vessels.

    142 Gallon Marine Water Tank MW-474

    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 142 Gallon Marine Water Tank, Part# MW-474, is engineered to meet the requirements of mobile...

    MSRP: $870.96
    $828.08
    Add to Cart
  • 142 Gallon Marine Water Tank MW-272. Technical drawing of a polyethylene water tank designed for marine vessels.

    142 Gallon Marine Water Tank MW-272

    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 142 Gallon Marine Water Tank, Part# MW-272, is engineered to meet the requirements of mobile...

    MSRP: $1,167.85
    $1,110.35
    Add to Cart
  • 143 Gallon RV Water Tank W-508. Technical drawing of a polyethylene water tank designed for your rv.

    143 Gallon RV Water Tank W-508

    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 143 Gallon RV Water Tank, Part# W-508, is engineered to meet the requirements of mobile water...

    MSRP: $1,166.35
    $1,108.93
    Add to Cart
  • 143 Gallon Marine Water Tank MW-508. Technical drawing of a polyethylene water tank designed for marine vessels.

    143 Gallon Marine Water Tank MW-508

    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 143 Gallon Marine Water Tank, Part# MW-508, is engineered to meet the requirements of mobile...

    MSRP: $934.46
    $888.46
    Add to Cart