Hot Water Heater Chattering - Check Valve
I own a 2011 Redwood 36RE.
Recently, there is a relatively loud humming/chattering noise when the hot water is turned on.
After doing some research, I believe I need to replace the brass check valve that attaches to the hot water source on the back of the 12 gallon Suburban hot water heater.
I haven't quite found my way to the problem area just yet. I can wiggle my way through plumbing to get within a foot or so from the rear of the water heater.
The brass check valve appears to be male (threaded) on each end.
Can anyone tell me the model of the check valve; or
a good replacement model check valve; or
if the current check valve is 3/4 or 1/2 NPT, or a combination of both.
Don in Maine