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JnJnKatiebug's avatar
JnJnKatiebug
Explorer
Dec 02, 2013

The dreaded plastic hot water plug/my fix

I see where people here have problems with their plastic hot water plug. Here is how I fixed mine. I used this for 9 years on my TT and now for 4 years on my MH so it has been well tested, never had a problem.

Went to Lowe's and bought a brass coupler, pipe threads on one end and male water hose on the other. Also bought a metal cap for a water hose. Use a little teflon tape and put the fitting in the HW heater (not too tight) then use the cap as needed. I only hand tighten the cap. Never had a leak and never have a problem getting the cap off, just change the washer every couple of years.

Added benefit is you can put a hose on it so the water does not run down the side of you camper or you can catch it in a bucket and use the hot water if needed.

There is a drop of water on the cap in the picture but I had just replaced the cap and did not wipe it off before I took the picture.


  • My first TT was a Dutchmen Sport and it had a plastic plug. That was more than 10 years ago now. I put one of these in the plug and didn't even have to unscrew it, or a cap. It worked great.

    Now that my water heater has an anode rod, this idea will not work.

  • downtheroad wrote:
    Good idea...and it sounds like you have tested it over time.

    Somehow, somewhere I thought I read that a metal plug would cause electrolysis/rust issues with the tank...(maybe not???)

    Have you ever replace your pop off valve? I bet it's brass.
  • robsouth wrote:
    downtheroad wrote:
    Somehow, somewhere I thought I read that a metal plug would cause electrolysis/rust issues with the tank...


    Me too. Advised to use only plastic plug to avoid ruining the tank. HMMMM


    As I stated I used mine for 9 years on my TT and now on my 4th year with the MH and no problems. To each his own, whatever you are comfortable with.
  • downtheroad wrote:
    Somehow, somewhere I thought I read that a metal plug would cause electrolysis/rust issues with the tank...


    Me too. Advised to use only plastic plug to avoid ruining the tank. HMMMM
  • Good idea...and it sounds like you have tested it over time.

    Somehow, somewhere I thought I read that a metal plug would cause electrolysis/rust issues with the tank...(maybe not???)
  • What a great idea, those plastic plugs/caps are miserable! Looks like a spring project for me.
  • Going to pick one up now! On another twist I use the same on with a bushing reducer and a 1/4" air chuck and use it to blow out my camper water lines so pick up a couple!
  • :h Why haven't I thought of that. I have been using a brass plug for about 8 years. I like your idea better. Thanks
  • Good idea! Over the years I've replaced several plastic fittings with brass ones in various RVs but hadn't really thought of that.

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