Could be 1/2" or 3/4" thread
Any hardware or rv store
They open at 150 psi/210*F (reset at 125 psi)
2006 it may need replacing.........may
Have you exercised the valve......stand back and open valve via lever with water turned on (water heater off and cold). Let it blow and then let lever 'snap' closed. Do a couple of times to clear valve/valve seat of any build up/debris
Also it is NOT uncommon for them to weep when heating the water if the air pocket in top portion of tank has been lost (water doesn't compress---air does---water expands/swells when heated---no air to compress then pressure increases)
Air pocket is normally established when filling water heater.
Over time the air can get absorbed into the water
To re-establish air pocket
Turn water OFF
Open closest faucet to relieve pressure on hot water
Open the PRV until water stops draining out.....then let it snap close
Turn on water
Close faucet
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31