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

Shipping Information

• Manufacture Lead Time: 3-5 Weeks 
  
• Ships From (State): ID
  

Products are subject to freight or parcel shipping costs. Shipping charges are calculated at checkout based on delivery location, product size, weight, and carrier requirements.

Each tank is manufactured and assembled in the USA using high-quality materials and strict quality control standards—built for long-term, dependable use in demanding applications.

Warranty Information

Custom Roto-Molding tanks are covered by a 5-year manufacturer warranty from the date of original purchase against defects in material and workmanship. Coverage applies to tanks that are correctly installed and have not been subjected to abuse or misuse, and is for the benefit of the original end user. The warranty does not cover misuse, fire, accident, negligence, transit damage, unauthorized modifications, excessive external pressure, abnormal use, product loss through leakage, or related injury/property damage. Manufacturer liability is limited to repair or, at its option, replacement of a qualifying defective product, subject to written notice within the warranty period and return of the item to the point of manufacture with transportation prepaid. For warranty details or to initiate a warranty claim, please contact Tank Supply Direct at info@tanksupplydirect.com.