How to Install an RV Holding Tank? Step by Step Guide

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There are three types of tanks that can be installed as a holding tank for an RV. The first type of tank allows you to have fresh water for drinking, showering, doing the dishes or washing your toilet. The second type of tank, called a “gray water tank,” contains the sewage from all drains except the toilets. And the last type of tank is a “sewage holding tank”, it contains the liquid and solid waste from the toilet. No matter what type of RV holding tank you want to install, you can complete your RV project with the guide below.

What you will need to install an RV holding tank?

  • Pen and Paper
  • RV
  • Holding Tank Water Pump
  • Monkey Wrench

RV holding tank

Step 1 – Choose the holding tank material

Holding tanks are made of different types of materials. They can be made of plastic, polyethylene and acrylonitrile-butadiene-styrene or ABS. Decide which subject is best based on your budget and application.

Step 2 – Draw your RV design

Draw the outline of your RV and decide where the best location is for your holding tank. Please note that plumbing fixtures are found in your RV. You’ll want to be specific in your drawings, making sure you mark where the toilet, sink, and shower fixtures are located.

Step 3 – Draw on the holding tanks

Next, describe where the holding tanks should be installed. For a black holding tank, you will want your toilet to be placed on top of it. A gray tank should be between the shower and the sink. A freshwater tank should be centrally located for easy hooking up to the shower, sinks and toilet.

Step 4 – Mount the freshwater pump

Follow the instructions provided on the water pump to install it correctly. Generally, you will need to mount the pump between your freshwater plumbing and the freshwater tank. The mounting here will help to pressurize the freshwater that will be delivered to the taps, shower and toilet.

Pay attention to the manufacturer’s instructions regarding the type of wiring required during this part of the installation. You will need to install the exact type and wire gauge for your specific water pump.

Step 5 – Mount the black and gray holding tanks

The black tank is the most important tank. The size of this tank should reflect your individual travel needs. For example, how far will you travel between fields without facilities to empty the tanks? Also, make sure your holding tank has accessories in an easily accessible area. Most manufacturers will mount the gaskets to your specifications.

Mount the tanks according to the manufacturer’s instructions. If you are installing a large set of tanks, you will need to purchase and install additional support bars or straps for additional safety measures.

Step 6 – Keep your tanks

Check your tanks frequently to make sure they are working properly. Older RV holding tanks can become loose, damaged, or cracked. However, the repair of these tanks is an easy project to complete.

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