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Cargo Trailer Camper Fresh Water Tank Plumbing Parts

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Cargo Trailer Camper Fresh Water Tank Plumbing Parts

#rv-plumbing#maintenance
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This bundle provides the essential plumbing components for a fresh water system in a cargo trailer camper conversion. It is suitable for DIY enthusiasts and professionals building an off-grid or semi-off-grid mobile living space. The products collectively enable water storage, delivery, and maintenance, ensuring a functional fresh water supply.

Curated by Workshop Notes · Updated June 2026

Built for DIY builders converting standard cargo trailers into off-grid campers who need a rugged, gravity-fed or pump-driven water system. Not for high-end motorhome owners looking for complex multi-tank electronic monitoring systems—this shop focuses on basic, serviceable plumbing.

Curator's pick: Shurflo 4008 Revolution Water Pump

This pump features a solid internal bypass design that maintains consistent flow without the rapid cycling frequency that often leads to premature motor burnout in smaller builds. The mounting footprint is standard, making it easier to swap or upgrade than proprietary OEM units.

⚠ Worth knowing: PEX-B plumbing systems require specific crimp tools and clearances; if space between the cargo trailer's inner wall and the tank is less than four inches, these rigid lines will be difficult to route without stressing the barb fittings.

Structural Framing for Cargo Trailer Conversions12V Electrical Systems for Off-Grid RVsGrey Water Drainage and Under-Chassis Tank Mounting

This shop provides the fundamental components for installing a fresh water system in your cargo trailer camper conversion. Inspired by real-world DIY builds, it focuses on reliable and commonly used parts essential for any functional off-grid water supply.

This water plumbing setup is ideal for DIY enthusiasts, van lifers, and off-grid adventurers building their own mobile living spaces. It caters specifically to individuals or couples needing a fresh water source for short to medium-term trips.

To get started, focus on the core components like the water tank and pump, costing around $130-$200. A full build, including all plumbing lines and accessories, can range from $190-$310, offering a complete and reliable fresh water system.

Full build

$190–$310

Starter

$130–$200

Tank + Pump Only

Best forCargo Trailer ConversionsOff-Grid LivingDIY Camper BuildsMobile Water SystemsWeekend TripsBeginner Builders

Class A Customs 20 Gallon Fresh Water Tank

Match 95%

Class A Customs

RV Plumbing$60 - $90

This 20-gallon fresh water tank is designed for potable water storage in RV and camper applications. It provides a standard capacity for individuals or couples on short trips, solving the need for onboard water supply.

  • 20-gallon capacity
  • Food-grade polyethylene
  • UV stabilized material
  • Rectangular form factor
  • For RVs and trailers

In this shop: This fresh water tank is a foundational piece, fitting the cargo trailer camper theme by providing critical water storage for mobile living.

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Shurflo 4008 Revolution Water Pump

Match 98%

Shurflo

RV Plumbing$70 - $110

The Shurflo 4008 Revolution Water Pump is a widely used 12V diaphragm pump for RV and off-grid water systems. It ensures consistent water pressure to faucets and showers, providing reliable water delivery for various uses.

  • 12V DC operation
  • 3.0 GPM flow rate
  • Quiet and efficient operation
  • Self-priming capability
  • On-demand pressure switch

In this shop: This water pump aligns with the cargo trailer camper vibe by offering a proven and reliable solution for water delivery in a mobile setup.

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PEX Tubing 1/2-Inch for RV Plumbing

Match 95%

SharkBite

RV Plumbing$10 - $30

1/2-inch PEX tubing is a flexible, durable material used for routing hot and cold fresh water lines in RVs and campers. It allows for easy installation around obstacles and provides a leak-resistant plumbing solution.

  • 1/2-inch diameter
  • Flexible potable water line
  • Heat and cold resistant
  • Red and blue options available
  • Suitable for mobile installs

In this shop: PEX tubing is the practical choice for a cargo trailer camper, offering the flexibility and durability required for mobile plumbing installations.

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Gravity Water Hatch Inlet with Lock

Match 92%

JR Products

RV Plumbing$15 - $25

This gravity water hatch inlet with a lock provides a secure and convenient external connection point for refilling your fresh water tank. It prevents unauthorized access while ensuring easy replenishment of your water supply.

  • Gravity fill type
  • Lockable cap
  • UV stabilized plastic
  • White color option
  • Exterior mounting

In this shop: The gravity water inlet is a necessary component, supporting the cargo trailer camper's need for accessible and secure external water filling.

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RV Water Tank Sanitizer and Cleaner

Match 85%

Camco

Maintenance$10 - $15

This sanitizer and cleaner solution is for maintaining the cleanliness and safety of your RV or camper's fresh water tank and system. It helps eliminate bacteria and odors, ensuring high-quality drinking water.

  • Concentrated liquid formula
  • Eliminates odors and bacteria
  • Safe for potable water tanks
  • Instructions included
  • Use for initial and routine cleaning

In this shop: Essential for hygiene, this sanitizer fits the cargo trailer camper theme by ensuring a safe and clean water supply for extended off-grid stays.

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1/2 Inch PEX Barb Fittings Kit

Match 90%

iGEAR

RV Plumbing$15 - $40

This kit contains various 1/2-inch PEX barb fittings, essential for connecting and branching PEX tubing in an RV or camper fresh water system. It enables customization of plumbing layouts from the tank to the fixtures.

  • Assorted 1/2-inch sizes
  • Lead-free brass material
  • Includes elbows, tees, couplings
  • Crimp or clamp compatible
  • For potable water systems

In this shop: The PEX barb fittings are crucial to the cargo trailer camper's plumbing, allowing flexible and secure connections throughout the fresh water system.

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What works

  • This bundle provides a complete and reliable fresh water supply system, from storage to delivery, essential for comfortable off-grid living.
  • The use of PEX tubing and barb fittings ensures a flexible and customizable plumbing layout, adapting easily to tight camper spaces.
  • Included sanitization components help maintain water quality, ensuring safe drinking and usage throughout your travels.

What to know

  • While comprehensive, this bundle does not include a water heater or fixtures like faucets and showerheads, which must be sourced separately.
  • Installing PEX tubing and fittings, while flexible, requires basic plumbing knowledge and the correct crimping tools for secure, leak-free connections.

How to use this together

  1. 1

    Install Fresh Water Tank

    Begin by securely mounting your Class A Customs 20 Gallon Fresh Water Tank in your chosen location, ensuring it's accessible for the Gravity Water Hatch Inlet and drainage. Proper mounting is crucial for safety and weight distribution in a moving vehicle.

  2. 2

    Connect Pump and Plumbing Lines

    Install the Shurflo 4008 Revolution Water Pump near the tank, connecting its inlet to the tank's outlet using PEX Tubing 1/2-Inch. Use the 1/2 Inch PEX Barb Fittings Kit to create your cold water lines from the pump to where your faucets and fixtures will be; ensure all connections are tight and secure to prevent leaks.

  3. 3

    Install Fill Inlet and Sanitize

    Mount the Gravity Water Hatch Inlet with Lock on the exterior of your trailer, connecting it directly to your fresh water tank for easy refills. Before first use, thoroughly clean and sanitize your entire system with the RV Water Tank Sanitizer and Cleaner to ensure potable drinking water.

Frequently asked questions