21 Gallon Custom Roto-Mold Marine Water Tank (MPN: MW-371)

Description

The Custom Roto-Mold 21 Gallon Marine Water Tank (Part# MW-371) is designed for efficient and dependable potable water storage in marine, RV, and mobile systems. With its broad, low-profile design, it fits easily into tight compartments, under benches, or within shallow storage bays—making it a top choice for space-conscious installations.

This tank is manufactured using rotational molding technology, producing a seamless, one-piece construction that eliminates weak points and resists cracking, leaking, and structural fatigue. Built from FDA-approved polyethylene resin, the MW-371 meets FDA Regulation 21 CFR 177.1520 (1) 3.1 and 3.2, confirming its safety for potable water storage.

The tank ships blank (no pre-installed fittings), allowing full flexibility for plumbing customization. Whether you're installing a freshwater system in a boat, van, or trailer, the MW-371 offers the strength and reliability you need.

Key Features

• 21-Gallon Capacity: Provides mid-range water storage for marine and RV freshwater systems.
• Rotationally Molded Construction: Seamless, single-piece body ensures long-lasting structural integrity.
• FDA-Compliant Polyethylene: Made with food-grade resin that is certified safe for drinking water use.
• Space-Saving Low-Profile Design: Measures 29.5" L x 20" W x 9" H, ideal for shallow or tight installation spaces.
• Rugged and Durable: Resists vibration, saltwater exposure, and UV radiation for outdoor reliability.
• Blank Configuration: Ships without fittings to support full plumbing customization.
• Lightweight and Easy to Install: Weighs only 27 lbs for convenient handling.
• Natural Translucent Color: Makes it easy to monitor water level visually.
• Made in the USA: Proudly manufactured in Oregon under strict quality standards.
  

Specifications

• Product type: Marine fresh water tank
• Part number: MW-371
• Capacity: 21 gallons
• Dimensions: 29.5" L x 20" W x 9" H
• Weight: 27 lbs
• Material: FDA-compliant polyethylene
• Wall thickness: Approx. 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.