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

Shop by Category

RV & Marine Tanks

  • An image of a 34 Gallon PP Ronco White Rectangular Open Top Tank | 24X12X30PP

    13 Gallon Marine Fresh Water Tank | B218

    This 13-gallon Ronco marine fresh water tank (B218) is built for onboard potable water storage on boats and watercraft. Measuring 48" x 10" x 9", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended trips on the...

    $269.13
    Add to Cart
  • An image of a 34 Gallon PE Ronco White Rectangular Open Top Tank | 24X12X30PE

    13 Gallon Marine Holding Tank | B218

    This 13-gallon Ronco marine holding tank (B218) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 48" x 10" x 9", it is designed to fit common marine compartment layouts while providing dependable waste...

    $269.13
    Add to Cart
  • An image of a 20 Gallon Marine Holding Tank | B291

    13 Gallon Marine Fresh Water Tank | B144

    This 13-gallon Ronco marine fresh water tank (B144) is built for onboard potable water storage on boats and watercraft. Measuring 20 1/8" x 17 1/4" x 9 3/8", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended...

    $269.13
    Add to Cart
  • An image of a 10 Gallon Marine Fresh Water Tank | B290

    13 Gallon Marine Holding Tank | B144

    This 13-gallon Ronco marine holding tank (B144) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 20 1/8" x 17 1/4" x 9 3/8", it is designed to fit common marine compartment layouts while providing dependable...

    $269.13
    Add to Cart
  • An image of a 26 Gallon Marine Fresh Water Tank | B406

    13 Gallon Marine Fresh Water Tank | B102

    This 13-gallon Ronco marine fresh water tank (B102) is built for onboard potable water storage on boats and watercraft. Measuring 27" x 20 3/4" x 12", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended trips on...

    $269.13
    Add to Cart
  • An image of a 26 Gallon Marine Holding Tank | B406

    13 Gallon Marine Holding Tank | B102

    This 13-gallon Ronco marine holding tank (B102) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 27" x 20 3/4" x 12", it is designed to fit common marine compartment layouts while providing dependable waste...

    $269.13
    Add to Cart
  • 13 Gallon RV Water Tank W-28. Technical drawing of a polyethylene water tank designed for your rv.

    13 Gallon RV Water Tank W-28

    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 13 Gallon RV Water Tank, Part# W-28, is engineered to meet the requirements of mobile water...

    MSRP: $103.68
    $98.58
    Add to Cart
  • 13 Gallon Marine Water Tank MW-28. Technical drawing of a polyethylene water tank designed for marine vessels.

    13 Gallon Marine Water Tank MW-28

    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 13 Gallon Marine Water Tank, Part# MW-28, is engineered to meet the requirements of mobile...

    MSRP: $219.64
    $208.82
    Add to Cart
  • 13 Gallon RV Holding Tank H-658. Technical drawing of a polyethylene holding tank designed for your rv and camper.

    13 Gallon RV Holding Tank H-658

    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 13 Gallon RV Holding Tank, Part# H-658, is engineered to meet the requirements of mobile...

    MSRP: $79.38
    $75.48
    Add to Cart
  • 13 Gallon RV Holding Tank H-657. Technical drawing of a polyethylene holding tank designed for your rv and camper.

    13 Gallon RV Holding Tank H-657

    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 13 Gallon RV Holding Tank, Part# H-657, is engineered to meet the requirements of mobile...

    MSRP: $116.64
    $110.90
    Add to Cart
  • 13 Gallon RV Holding Tank H-594 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    13 Gallon RV Holding Tank H-594

    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 13 Gallon RV Holding Tank, Part# H-594, is engineered to meet the requirements of mobile...

    MSRP: $90.72
    $86.25
    Add to Cart
  • 13 Gallon RV Holding Tank H-573 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    13 Gallon RV Holding Tank H-573

    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 13 Gallon RV Holding Tank, Part# H-573, is engineered to meet the requirements of mobile...

    MSRP: $97.20
    $92.41
    Add to Cart
  • 13 Gallon RV Holding Tank H-435 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    13 Gallon RV Holding Tank H-435

    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 13 Gallon RV Holding Tank, Part# H-435, is engineered to meet the requirements of mobile...

    MSRP: $129.60
    $123.22
    Add to Cart
  • 13 Gallon RV Holding Tank H-302 . Technical drawing of a polyethylene holding tank designed for your rv and camper.

    13 Gallon RV Holding Tank H-302

    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 13 Gallon RV Holding Tank, Part# H-302, is engineered to meet the requirements of mobile...

    MSRP: $190.44
    $181.06
    Add to Cart
  • An image of a 80 Gallon Marine Holding Tank | B230

    14 Gallon RV Fresh Water Tank | RVB534

    This 14-gallon Ronco RV fresh water tank (RVB534) provides reliable potable water storage for recreational vehicles. Measuring 16 1/5" x 15 3/4" x 14", it is sized to fit a range of RV builds and offers dependable water capacity for trips of all lengths...

    $191.81
    Add to Cart
  • An image of a 17 Gallon Marine Holding Tank | B226

    14 Gallon RV Fresh Water Tank | RVB274

    This 14-gallon Ronco RV fresh water tank (RVB274) provides reliable potable water storage for recreational vehicles. Measuring 15 5/8" x 15 5/8" x 15 1/8", it is sized to fit a range of RV builds and offers dependable water capacity for trips of all...

    $181.76
    Add to Cart
  • An image of a 19 Gallon Marine Holding Tank | B183

    14 Gallon RV Fresh Water Tank | RVB265

    This 14-gallon Ronco RV fresh water tank (RVB265) provides reliable potable water storage for recreational vehicles. Measuring 17 1/2" x 14 1/2" x 14 1/4", it is sized to fit a range of RV builds and offers dependable water capacity for trips of all...

    $159.67
    Add to Cart
  • An image of a 32 Gallon Marine Holding Tank | B258

    14 Gallon RV Fresh Water Tank | RVB245

    This 14-gallon Ronco RV fresh water tank (RVB245) provides reliable potable water storage for recreational vehicles. Measuring 24 1/2" x 16 1/2" x 9 1/8", it is sized to fit a range of RV builds and offers dependable water capacity for trips of all...

    $181.76
    Add to Cart
  • An image of a 18 Gallon Marine Fresh Water Tank | B232

    14 Gallon RV Holding Tank | RV40H

    This 14-gallon Ronco RV holding tank (RV40H) is designed for blackwater and greywater waste storage in recreational vehicles. Measuring 33" x 16" x 8", it fits common RV underbelly and compartment configurations while providing reliable waste containment...

    $187.79
    Add to Cart
  • An image of a 70 Gallon Marine Holding Tank | B154

    14 Gallon RV Fresh Water Tank | RV3W

    This 14-gallon Ronco RV fresh water tank (RV3W) provides reliable potable water storage for recreational vehicles. Measuring 29 3/4" x 13 7/8" x 8 1/8", it is sized to fit a range of RV builds and offers dependable water capacity for trips of all lengths...

    $199.84
    Add to Cart
  • An image of a 42 Gallon Marine Holding Tank | B237

    14 Gallon RV Fresh Water Tank | RV37W

    This 14-gallon Ronco RV fresh water tank (RV37W) provides reliable potable water storage for recreational vehicles. Measuring 29 3/4" x 16" x 7 1/2", it is sized to fit a range of RV builds and offers dependable water capacity for trips of all lengths...

    $250.05
    Add to Cart
  • An image of a 48 Gallon Marine Fresh Water Tank | B229

    14 Gallon Marine Fresh Water Tank | B534

    This 14-gallon Ronco marine fresh water tank (B534) is built for onboard potable water storage on boats and watercraft. Measuring 16 1/5" x 15 3/4" x 14", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended...

    $291.22
    Add to Cart
  • An image of a 48 Gallon Marine Holding Tank | B229

    14 Gallon Marine Holding Tank | B534

    This 14-gallon Ronco marine holding tank (B534) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 16 1/5" x 15 3/4" x 14", it is designed to fit common marine compartment layouts while providing dependable...

    $291.22
    Add to Cart
  • An image of a 25 Gallon Marine Fresh Water Tank | B225

    14 Gallon Marine Fresh Water Tank | B274

    This 14-gallon Ronco marine fresh water tank (B274) is built for onboard potable water storage on boats and watercraft. Measuring 15 5/8" x 15 5/8" x 15 1/8", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended...

    $232.98
    Add to Cart
  • An image of a 25 Gallon Marine Holding Tank | B225

    14 Gallon Marine Holding Tank | B274

    This 14-gallon Ronco marine holding tank (B274) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 5 5/8" x 15 5/8" x 15 1/8", it is designed to fit common marine compartment layouts while providing dependable...

    $232.98
    Add to Cart
  • An image of a 42 Gallon Marine Fresh Water Tank | B182

    14 Gallon Marine Fresh Water Tank | B265

    This 14-gallon Ronco marine fresh water tank (B265) is built for onboard potable water storage on boats and watercraft. Measuring 17 1/2" x 14 1/2" x 14 1/4", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended...

    $232.98
    Add to Cart
  • An image of a 20 Gallon Marine Fresh Water Tank | B181

    14 Gallon Marine Holding Tank | B265

    This 14-gallon Ronco marine holding tank (B265) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 17 1/2" x 14 1/2" x 14 1/4", it is designed to fit common marine compartment layouts while providing dependable...

    $232.98
    Add to Cart
  • An image of a 20 Gallon Marine Fresh Water Tank | B257

    14 Gallon Marine Fresh Water Tank | B245

    This 14-gallon Ronco marine fresh water tank (B245) is built for onboard potable water storage on boats and watercraft. Measuring 24 1/2" x 16 1/2" x 9 1/8", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended...

    $232.98
    Add to Cart
  • An image of a 20 Gallon Marine Holding Tank | B257

    14 Gallon Marine Holding Tank | B245

    This 14-gallon Ronco marine holding tank (B245) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 24 1/2" x 16 1/2" x 9 1/8", it is designed to fit common marine compartment layouts while providing dependable...

    $232.98
    Add to Cart
  • An image of a 42 Gallon Marine Holding Tank | B182

    14 Gallon Marine Fresh Water Tank | B238

    This 14-gallon Ronco marine fresh water tank (B238) is built for onboard potable water storage on boats and watercraft. Measuring 19 1/2" x 14 1/2" x 14 1/2", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended...

    $268.13
    Add to Cart
  • An image of a 20 Gallon Marine Holding Tank | B181

    14 Gallon Marine Holding Tank | B238

    This 14-gallon Ronco marine holding tank (B238) is purpose-built for blackwater and greywater waste storage on boats and watercraft. Measuring 19 1/2" x 14 1/2" x 14 1/2", it is designed to fit common marine compartment layouts while providing dependable...

    $268.13
    Add to Cart
  • An image of a 150 Gallon Marine Fresh Water Tank | B411

    14 Gallon Marine Fresh Water Tank | B160

    This 14-gallon Ronco marine fresh water tank (B160) is built for onboard potable water storage on boats and watercraft. Measuring 27 1/2" x 21" x 15 3/4", it fits a wide range of vessel layouts and provides reliable fresh water capacity for extended...

    $281.18
    Add to Cart