31 Gallon Custom Roto-Mold Marine Water Tank (MPN: MW-529)

Description

The Custom Roto-Mold 31 Gallon Marine Water Tank (Part# MW-529) is designed for dependable potable water storage in marine and mobile environments where strength and compact form are essential. With a tall rectangular profile, it provides vertical storage efficiency while maintaining a small footprint—ideal for boats, RVs, trailers, and custom mobile builds.

Manufactured using rotational molding technology, this tank features a seamless, one-piece construction that eliminates weak points found in welded or seamed alternatives. It offers long-term resistance to cracking, warping, and structural failure, even under vibration, shifting loads, or marine stress conditions.

The tank is built from FDA-approved polyethylene resin and complies with FDA Regulation 21 CFR 177.1520 (1) 3.1 and 3.2, making it completely safe for storing drinking water. With a capacity of 31 gallons and a weight of only 41 lbs, the MW-529 is easy to handle and install, while its marine-grade durability ensures long-lasting performance in harsh, high-moisture environments.

Key Features

• 31-Gallon Capacity: Compact yet efficient water storage for boats, RVs, and mobile setups.
• Rotationally Molded Design: Seamless, single-piece construction resists cracking and fatigue.
• Food-Grade Polyethylene: FDA-compliant material ensures safe potable water use.
• Space-Saving Shape: Stands 18.25" high with a 34" x 18.5" footprint for tight installations.
• Marine-Tough Build: Engineered to withstand vibration, salt, and exposure without failure.
• Blank Tank: Ships without fittings, offering flexibility in port layout and plumbing.
• Easy to Install: Lightweight at 41 lbs, making it manageable for one or two people.
• Made in the USA: Proudly manufactured in Oregon with strict quality control.
  

Specifications

• Product type: Marine fresh water tank
• Part number: MW-529
• Capacity: 31 gallons
• Dimensions: 34" L x 18.5" W x 18.25" H
• Weight: 41 lbs
• Material: FDA-compliant polyethylene
• Wall thickness: 0.25"
• Color: Natural (Translucent white)
• Fittings: Blank (no pre-installed fittings)
• Manufacturing location: Oregon, USA
• Application: Potable water (Marine use)
  

Shipping & Warranty

Ships FOB from Idaho (Zip Code: 83605), Freight Class 250. Liftgate service is available upon request for residential or limited-access delivery locations.

Covered by a 1-Year Limited Warranty against defects in materials and workmanship under normal use conditions.

Price Match Guarantee

If you find the 31 Gallon Custom Roto-Mold Marine Water Tank (MW-529) at a lower price from an authorized competitor within 6 months, we’ll match it and refund the difference.

Contact: info@tanksupplydirect.com