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JoshInReno's avatar
JoshInReno
Explorer
Sep 21, 2017

Water Heater Pressure Relief Valve Outlet Size?

I have a stinky (mild rotten egg smell) water heater on my trailer that I need to deodorize with hydrogen peroxide. I am thinking of filling the water heater through the pressure relief valve. But I d...
Old-Biscuit's avatar
Old-Biscuit
Explorer III
Sep 21, 2017
Suburban uses a 3/4" NPT

Atwood uses a 1/2" NPT IF it is a 2003 and older model
Atwood uses a 3/4" NPT IF it is a 2004 and newer model


Really don't need any fittings, adapters etc

Just remove T&P Relief Valve and pour vinegar (4 gal to 2 gal water) or Hydrogen Peroxide solutions in thru opening using a FUNNEL'

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