How to Replace Your RV's Backflow Preventer

  • 2-6 hours
  • Beginner
  • 25-100
What You'll Need
A pipe wrench
A tubing cutter
Some ferrules and hydraulic fittings
A metal drip plan
Line wrenches

If your RV/s backflow preventer needs replacement you don’t need to hire a professional to do this for you. This article will help you replace your backflow prevention valve. A backflow prevention device is an important tool for protecting the supply of water against contamination or pollution. It is a one-way valve also called a check valve that automatically closes and prevents the water from backing up to the supply line. For the recreational vehicles the backflow operates like that of a garden hose. If the RV’s backflow valve failed to work and the hose is left out with direct contact to the contaminated water, then most likely the water will go up and pollute the clean water.

Step 1 – Check the Backflow Preventer

Check valves are available in different sizes, so when you buy one make sure that the check valve you chose fits. Place the metal drip plan underneath the tubing or hose and check the backflow preventer which needs to be replaced.

Step 2 – Remove the Valve from the Tubing

Detach the fittings using a line wrench of pipe wrench in a counter-clockwise direction to loosen its grip. Allow any pressure inside the line to go out while detaching the fittings until it is completely unfastened. After removing the fittings, proceed to also remove the check valve from the tubing and let the left over water flow to the metal drip plan.

Step 3 – Replace the Fittings

If you need to replace the fittings as well, take some time to do this first with the aid of the tubing cutter. Cut the tubing below to remove the old fittings and attach the new ferrules and hydraulic fittings. Do the same with another set of fittings.

Step 4 – Attach the New Backflow Valve

Set up the new backflow valve against the new fitting and use a line wrench to secure it in place. Check if the newly attached valve is properly set facing the right direction and with the embossed arrows pointing to the direction of water flow.

Replace the backflow earlier to avoid further damage to your main water system and your health.