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

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RV & Marine Tanks

  • 60 Gallon RV Holding Tank H-365 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    60 Gallon RV Holding Tank H-365

    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 60 Gallon RV Holding Tank, Part# H-365, is engineered to meet the requirements of mobile...

    MSRP: $311.03
    $295.72
    Add to Cart
  • 60 Gallon RV Holding Tank H-282 [OR] . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    60 Gallon RV Holding Tank H-282 [OR]

    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 60 Gallon RV Holding Tank, Part# H-282 [OR], is engineered to meet the requirements of mobile...

    MSRP: $362.87
    $345.01
    Add to Cart
  • 60 Gallon RV Holding Tank H-268 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    60 Gallon RV Holding Tank H-268

    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 60 Gallon RV Holding Tank, Part# H-268, is engineered to meet the requirements of mobile...

    MSRP: $362.87
    $345.01
    Add to Cart
  • 60 Gallon RV Holding Tank H-260 [OR) . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    60 Gallon RV Holding Tank H-260 [OR)

    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 60 Gallon RV Holding Tank, Part# H-260 [OR), is engineered to meet the requirements of mobile...

    MSRP: $362.87
    $345.01
    Add to Cart
  • 60 Gallon RV Holding Tank H-143(OR). Technical drawing of a polyethylene holding tank designed for your rv and camper.

    60 Gallon RV Holding Tank H-143(OR)

    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 60 Gallon RV Holding Tank, Part# H-143(OR), is engineered to meet the requirements of mobile...

    MSRP: $388.79
    $369.65
    Add to Cart
  • 61 Gallon RV Holding Tank H-629. Technical drawing of a polyethylene holding tank designed for your rv and camper.

    61 Gallon RV Holding Tank H-629

    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 61 Gallon RV Holding Tank, Part# H-629, is engineered to meet the requirements of mobile...

    MSRP: $401.70
    $381.92
    Add to Cart
  • An image of a 42 Gallon RV Fresh Water Tank | RVB380

    62 Gallon RV Holding Tank | RV81H

    This 62-gallon Ronco RV holding tank (RV81H) is designed for blackwater and greywater waste storage in recreational vehicles. Measuring 57" x 63" x 10", it fits common RV underbelly and compartment configurations while providing reliable waste...

    $608.57
    Add to Cart
  • An image of a 14 Gallon RV Fresh Water Tank | RV37W

    62 Gallon Marine Fresh Water Tank | B244

    This 62-gallon Ronco marine fresh water tank (B244) is built for onboard potable water storage on boats and watercraft. Measuring 30" x 27 1/2" x 18 7/8", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended...

    $515.18
    Add to Cart
  • An image of a 36 Gallon RV Holding Tank | RV37H

    62 Gallon Marine Holding Tank | B244

    This 62-gallon Ronco marine holding tank (B244) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 30" x 27 1/2" x 18 7/8", it is designed to fit common marine compartment layouts while providing dependable...

    $515.18
    Add to Cart
  • 62 Gallon RV Water Tank W-542. Technical drawing of a polyethylene water tank designed for your rv.

    62 Gallon RV Water Tank W-542

    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 62 Gallon RV Water Tank, Part# W-542, is engineered to meet the requirements of mobile water...

    MSRP: $362.87
    $345.01
    Add to Cart
  • 62 Gallon Marine Water Tank MW-542. Technical drawing of a polyethylene water tank designed for marine vessels.

    62 Gallon Marine Water Tank MW-542

    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 62 Gallon Marine Water Tank, Part# MW-542, is engineered to meet the requirements of mobile...

    MSRP: $891.31
    $847.43
    Add to Cart
  • 62 Gallon RV Holding Tank H-598 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    62 Gallon RV Holding Tank H-598

    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 62 Gallon RV Holding Tank, Part# H-598, is engineered to meet the requirements of mobile...

    MSRP: $414.71
    $394.29
    Add to Cart
  • 62 Gallon RV Holding Tank H-275 [OR] . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    62 Gallon RV Holding Tank H-275 [OR]

    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 62 Gallon RV Holding Tank, Part# H-275 [OR], is engineered to meet the requirements of mobile...

    MSRP: $336.95
    $320.36
    Add to Cart
  • An image of a 92 Gallon Marine Fresh Water Tank | B483

    64 Gallon Marine Fresh Water Tank | B307

    This 64-gallon Ronco marine fresh water tank (B307) is built for onboard potable water storage on boats and watercraft. Measuring 45" x 23" x 15 3/4", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended trips on...

    $538.27
    Add to Cart
  • An image of a 92 Gallon Marine Holding Tank | B483

    64 Gallon Marine Holding Tank | B307

    This 64-gallon Ronco marine holding tank (B307) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 45" x 23" x 15 3/4", it is designed to fit common marine compartment layouts while providing dependable waste...

    $538.27
    Add to Cart
  • 64 Gallon RV Water Tank W-536. Technical drawing of a polyethylene water tank designed for your rv.

    64 Gallon RV Water Tank W-536

    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 64 Gallon RV Water Tank, Part# W-536, is engineered to meet the requirements of mobile water...

    MSRP: $285.11
    $271.08
    Add to Cart
  • 64 Gallon Marine Water Tank MW-536. Technical drawing of a polyethylene water tank designed for marine vessels.

    64 Gallon Marine Water Tank MW-536

    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 64 Gallon Marine Water Tank, Part# MW-536, is engineered to meet the requirements of mobile...

    MSRP: $732.37
    $696.31
    Add to Cart
  • 64 Gallon RV Holding Tank H-451 [OR] . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    64 Gallon RV Holding Tank H-451 [OR]

    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 64 Gallon RV Holding Tank, Part# H-451 [OR], is engineered to meet the requirements of mobile...

    MSRP: $401.75
    $381.97
    Add to Cart
  • An image of a 28 Gallon RV Fresh Water Tank | RVB273

    65 Gallon RV Holding Tank | RV86H

    This 65-gallon Ronco RV holding tank (RV86H) is designed for blackwater and greywater waste storage in recreational vehicles. Measuring 52" x 36" x 12", it fits common RV underbelly and compartment configurations while providing reliable waste...

    $608.57
    Add to Cart
  • An image of a 90 Gallon RV Fresh Water Tank | RV64W

    65 Gallon RV Fresh Water Tank | B324

    This 65-gallon Ronco RV fresh water tank (B324) provides reliable potable water storage for recreational vehicles. Measuring 37" x 30" x 15", it is sized to fit a range of RV builds and offers dependable water capacity for trips of all lengths...

    $572.41
    Add to Cart
  • An image of a 27 Gallon RV Holding Tank | RV64H

    65 Gallon Marine Fresh Water Tank | B324

    This 65-gallon Ronco marine fresh water tank (B324) is built for onboard potable water storage on boats and watercraft. Measuring 37" x 30" x 15", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended trips on the...

    $572.41
    Add to Cart
  • An image of a 58 Gallon RV Fresh Water Tank | RV63W

    65 Gallon Marine Holding Tank | B324

    This 65-gallon Ronco marine holding tank (B324) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 37" x 30" x 15", it is designed to fit common marine compartment layouts while providing dependable waste...

    $572.41
    Add to Cart
  • An image of a 33 Gallon Marine Holding Tank | BOAT53W

    65 Gallon RV Fresh Water Tank | B297

    This 65-gallon Ronco RV fresh water tank (B297) provides reliable potable water storage for recreational vehicles. Measuring 28" x 25" x 24", it is sized to fit a range of RV builds and offers dependable water capacity for trips of all lengths...

    $550.32
    Add to Cart
  • An image of a 28 Gallon Marine Fresh Water Tank | BOAT52W

    65 Gallon Marine Fresh Water Tank | B297

    This 65-gallon Ronco marine fresh water tank (B297) is built for onboard potable water storage on boats and watercraft. Measuring 28" x 25" x 24", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended trips on the...

    $550.32
    Add to Cart
  • An image of a 28 Gallon Marine Holding Tank | BOAT52W

    65 Gallon Marine Holding Tank | B297

    This 65-gallon Ronco marine holding tank (B297) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 28" x 25" x 24", it is designed to fit common marine compartment layouts while providing dependable waste...

    $550.32
    Add to Cart
  • An image of a 141 Gallon Marine Holding Tank | B484

    65 Gallon Marine Fresh Water Tank | B292

    This 65-gallon Ronco marine fresh water tank (B292) is built for onboard potable water storage on boats and watercraft. Measuring 48" x 23" x 15 1/2", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended trips on...

    $597.52
    Add to Cart
  • An image of a 92 Gallon RV Fresh Water Tank | B483

    65 Gallon Marine Holding Tank | B292

    This 65-gallon Ronco marine holding tank (B292) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 48" x 23" x 15 1/2", it is designed to fit common marine compartment layouts while providing dependable waste...

    $597.52
    Add to Cart
  • An image of a 160/205 Gallon Double Wall Tank | RONCO160205DC

    65 Gallon Marine Fresh Water Tank | B289

    This 65-gallon Ronco marine fresh water tank (B289) is built for onboard potable water storage on boats and watercraft. Measuring 33 1/8" x 26" x 21 3/4", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended...

    $608.57
    Add to Cart
  • An image of a 120/160 Gallon Double Wall Tank | RONCO120160DC

    65 Gallon Marine Holding Tank | B289

    This 65-gallon Ronco marine holding tank (B289) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 33 1/8" x 26" x 21 3/4", it is designed to fit common marine compartment layouts while providing dependable...

    $608.57
    Add to Cart
  • An image of a 45 Gallon RV Holding Tank | RV75H

    65 Gallon RV Fresh Water Tank | B283

    This 65-gallon Ronco RV fresh water tank (B283) provides reliable potable water storage for recreational vehicles. Measuring 39 1/8" x 30 7/8" x 13 1/2", it is sized to fit a range of RV builds and offers dependable water capacity for trips of all...

    $549.32
    Add to Cart
  • An image of a 42 Gallon RV Holding Tank | RV74H

    65 Gallon Marine Fresh Water Tank | B283

    This 65-gallon Ronco marine fresh water tank (B283) is built for onboard potable water storage on boats and watercraft. Measuring 39 1/8" x 30 7/8" x 13 1/2", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended...

    $549.32
    Add to Cart
  • An image of a 37 Gallon RV Holding Tank | RV73H

    65 Gallon Marine Holding Tank | B283

    This 65-gallon Ronco marine holding tank (B283) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 39 1/8" x 30 7/8" x 13 1/2", it is designed to fit common marine compartment layouts while providing dependable...

    $549.32
    Add to Cart