18 Gallon Custom Roto-Mold Marine Water Tank (MPN: MW-502)

Description

The Custom Roto-Mold 18 Gallon Marine Water Tank (Part# MW-502) is designed to meet the needs of compact potable water storage in marine, RV, van, and trailer applications. Its slim and elongated form factor is perfect for narrow, low-clearance installation areas, such as under benches, along walls, or beneath flooring.

Manufactured using rotationally molded polyethylene, this tank offers exceptional structural integrity, with a seamless, one-piece design that resists cracks, chips, and stress fractures in mobile or high-vibration environments.

Constructed with FDA-approved resin, the MW-502 complies with FDA Regulation 21 CFR 177.1520 (1) 3.1 and 3.2, ensuring safe storage of drinking water. It ships blank (no pre-installed fittings), allowing you full customization of inlet, outlet, and vent placements.

Key Features

• 18-Gallon Capacity – A reliable solution for compact freshwater systems in boats, campers, and off-grid rigs.
• Rotationally Molded Construction – Seamless and impact-resistant build ensures long-lasting, leak-free performance.
• FDA-Compliant Polyethylene – Manufactured from food-grade material certified safe for potable water use.
• Slim, Low-Profile Design – Measures 55" L x 13.5" W x 6" H, ideal for tight, narrow compartments.
• Marine-Grade Durability – Built to withstand UV rays, saltwater, and vibration in mobile environments.
• Blank Configuration – Ships without fittings for flexible, custom plumbing setup.
• Lightweight and Manageable – Weighs 30 lbs, easy to transport and install with basic assistance.
• Made in the USA – Proudly produced in Oregon, meeting high standards of safety and quality.
  

Specifications

• Product Type: Marine fresh water tank
• Part Number: MW-502
• Capacity: 18 gallons
• Dimensions: 55" L x 13.5" W x 6" H
• Weight: 30 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.