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

  • 12 Gallon RV Water Tank L-2. Technical drawing of a polyethylene water tank designed for your rv.

    12 Gallon RV Water Tank L-2

    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 12 Gallon RV Water Tank, Part# L-2, is engineered to meet the requirements of mobile water...

    MSRP: $103.68
    $98.58
    Add to Cart
  • 12 Gallon Marine Water Tank ML-2. Technical drawing of a polyethylene water tank designed for marine vessels.

    12 Gallon Marine Water Tank ML-2

    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 12 Gallon Marine Water Tank, Part# ML-2, is engineered to meet the requirements of mobile...

    MSRP: $195.03
    $185.43
    Add to Cart
  • 12 Gallon RV Holding Tank H-667. Technical drawing of a polyethylene holding tank designed for your rv and camper.

    12 Gallon RV Holding Tank H-667

    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 12 Gallon RV Holding Tank, Part# H-667, is engineered to meet the requirements of mobile...

    MSRP: $142.56
    $135.54
    Add to Cart
  • 12 Gallon RV Holding Tank H-575 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    12 Gallon RV Holding Tank H-575

    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 12 Gallon RV Holding Tank, Part# H-575, is engineered to meet the requirements of mobile...

    MSRP: $90.72
    $86.25
    Add to Cart
  • 12 Gallon RV Holding Tank H-322 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    12 Gallon RV Holding Tank H-322

    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 12 Gallon RV Holding Tank, Part# H-322, is engineered to meet the requirements of mobile...

    MSRP: $142.56
    $135.54
    Add to Cart
  • 12 Gallon RV Holding Tank H-292 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    12 Gallon RV Holding Tank H-292

    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 12 Gallon RV Holding Tank, Part# H-292, is engineered to meet the requirements of mobile...

    MSRP: $116.64
    $110.90
    Add to Cart
  • 12 Gallon RV Holding Tank H-291 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    12 Gallon RV Holding Tank H-291

    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 12 Gallon RV Holding Tank, Part# H-291, is engineered to meet the requirements of mobile...

    MSRP: $110.16
    $104.74
    Add to Cart
  • 12 Gallon RV Holding Tank H-219L. Technical drawing of a polyethylene holding tank designed for your rv and camper.

    12 Gallon RV Holding Tank H-219L

    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 12 Gallon RV Holding Tank, Part# H-219L, is engineered to meet the requirements of mobile...

    MSRP: $170.95
    $162.53
    Add to Cart
  • An image of a 30 Gallon Marine Fresh Water Tank | B179

    13 Gallon RV Fresh Water Tank | RVB266

    The 13 Gallon RV Fresh Water Tank by One Clarion is a must-have for any RV owner. This portable water tank is designed specifically for RVs, with a rectangular shape that allows for easy storage and transportation. Made from durable polyethylene, this...

    $250.05
    Add to Cart
  • An image of a 16 Gallon Marine Fresh Water Tank | B215

    13 Gallon RV Fresh Water Tank | RVB262

    Introducing the 13 Gallon RV Fresh Water Tank by One Clarion. This portable water tank is specifically designed for RV use, making it the perfect solution for your on-the-go water needs. With its rectangular shape and compact size, it is easy to...

    $181.76
    Add to Cart
  • An image of a 18 Gallon RV Fresh Water Tank | RVB369

    13 Gallon RV Holding Tank | RV46H

    Introducing the 13 Gallon RV Holding Tank by One Clarion. This rectangular tank is designed specifically for RV use, making it the perfect portable solution for your waste management needs. With its above ground placement, you can easily access and...

    $386.63
    Add to Cart
  • An image of a 4 Gallon Marine Holding Tank | B269

    13 Gallon RV Holding Tank | RV26H

    Introducing the 13 Gallon RV Holding Tank by One Clarion. This rectangular tank is designed specifically for RV use, making it the perfect portable solution for your waste management needs. With its above ground placement, you can easily access and...

    $210.88
    Add to Cart