18 Gallon Custom Roto-Mold RV Holding Tank (MPN: H-640)

Description

The Custom Roto-Mold 18 Gallon RV Holding Tank (Part# H-640) is engineered to meet the requirements of compact mobile holding storage applications, including RVs, trailers, sprinter vans, food trucks, and off-grid setups. Its low-profile design and narrow footprint make it ideal for tight installation spaces where height is a constraint.

Constructed through rotational molding technology, the tank features a seamless, one-piece build that ensures long-term performance and protection from leaks, cracks, or ruptures. Made from FDA-approved polyethylene resin, the tank complies with FDA Regulation 21 CFR 177.1520 (1) 3.1 and 3.2, ensuring safe containment of potable water, greywater, or blackwater.

The Tank Superstore’s knowledgeable team is ready to assist with product selection and application-specific support.

Key Features

• 18-Gallon Capacity: Ideal for small mobile units requiring compact water or waste storage.
• Rotationally Molded Construction: Seamless, one-piece design ensures durability and leak prevention.
• FDA-Compliant Polyethylene: Safe for potable water, greywater, or blackwater applications.
• Ultra Low-Profile Design: At only 6" tall, it fits into extremely tight vertical spaces.
• Built to Last: UV-resistant and able to withstand impact, vibration, and chemical exposure.
• Blank Tank Configuration: Ships without fittings; customize plumbing as needed.
• Lightweight & Durable: Weighs just 13 lbs, making it easy to handle and install.
• Made in the USA: Manufactured in Oregon under strict quality assurance protocols.
  

Specifications

• Product Type: RV Holding Tank
• Part Number: H-640
• Capacity: 18 Gallons
• Dimensions: 46" L x 22" W x 6" H
• Weight: 13 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, Greywater, or Blackwater
  

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.