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 20 Gallon Marine Fresh Water Tank | B349

    16 Gallon Marine Holding Tank | B109

    The 16 Gallon Marine Holding Tank from One Clarion is a rectangular, portable tank designed for above ground use in marine environments. Made from durable polyethylene in a sleek black color, this tank is perfect for holding waste on boats or other...

    $246.04
    Add to Cart
  • An image of a 115 Gallon RV Fresh Water Tank | B466

    16 Gallon Marine Fresh Water Tank | B107

    The 16 Gallon Marine Fresh Water Tank offered by One Clarion is a versatile and portable solution for your marine water storage needs. With its rectangular shape and above ground usability, this tank is designed to fit seamlessly into your boat or marine...

    $246.04
    Add to Cart
  • An image of a 115 Gallon Marine Fresh Water Tank | B466

    16 Gallon Marine Holding Tank | B107

    The 16 Gallon Marine Holding Tank offered by One Clarion is a versatile and portable solution for your marine waste management needs. With its rectangular shape and above ground usability, this tank is designed to fit seamlessly into your boat or marine...

    $246.04
    Add to Cart
  • An image of a 14 Gallon Marine Holding Tank | B238

    16 Gallon Marine Fresh Water Tank | B106

    The 16 Gallon Marine Fresh Water Tank offered by One Clarion is a versatile and portable solution for your marine water storage needs. With its rectangular shape and compact dimensions of 16" Length x 16" Width x 16" Height, this tank is designed to fit...

    $232.98
    Add to Cart
  • An image of a 42 Gallon Marine Fresh Water Tank | B237

    16 Gallon Marine Holding Tank | B106

    Introducing the 16 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...

    $232.98
    Add to Cart
  • 16 Gallon RV Water Tank W-559. Technical drawing of a polyethylene water tank designed for your rv.

    16 Gallon RV Water Tank W-559

    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 16 Gallon RV Water Tank, Part# W-559, is engineered to meet the requirements of mobile water...

    MSRP: $168.48
    $160.19
    Add to Cart
  • 16 Gallon RV Water Tank W-551. Technical drawing of a polyethylene water tank designed for your rv.

    16 Gallon RV Water Tank W-551

    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 16 Gallon RV Water Tank, Part# W-551, is engineered to meet the requirements of mobile water...

    MSRP: $116.64
    $110.90
    Add to Cart
  • 16 Gallon RV Water Tank W-492. Technical drawing of a polyethylene water tank designed for your rv.

    16 Gallon RV Water Tank W-492

    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 16 Gallon RV Water Tank, Part# W-492, is engineered to meet the requirements of mobile water...

    MSRP: $259.19
    $246.44
    Add to Cart
  • 16 Gallon RV Water Tank W-282. Technical drawing of a polyethylene water tank designed for your rv.

    16 Gallon RV Water Tank W-282

    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 16 Gallon RV Water Tank, Part# W-282, is engineered to meet the requirements of mobile water...

    MSRP: $129.60
    $123.22
    Add to Cart
  • 16 Gallon Marine Water Tank MW-559. Technical drawing of a polyethylene water tank designed for marine vessels.

    16 Gallon Marine Water Tank MW-559

    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 16 Gallon Marine Water Tank, Part# MW-559, is engineered to meet the requirements of mobile...

    MSRP: $232.17
    $220.74
    Add to Cart
  • 16 Gallon Marine Water Tank MW-551. Technical drawing of a polyethylene water tank designed for marine vessels.

    16 Gallon Marine Water Tank MW-551

    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 16 Gallon Marine Water Tank, Part# MW-551, is engineered to meet the requirements of mobile...

    MSRP: $258.66
    $245.92
    Add to Cart
  • 16 Gallon Marine Water Tank MW-492. Technical drawing of a polyethylene water tank designed for marine vessels.

    16 Gallon Marine Water Tank MW-492

    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 16 Gallon Marine Water Tank, Part# MW-492, is engineered to meet the requirements of mobile...

    MSRP: $223.33
    $212.33
    Add to Cart