I recently had to move hot water tank. Drained tank using plastic drain valve on bottom of tank. The valve now leaks and I’m afraid to overtighten it . Have it plugged with garden hose fitting. What I’d like to do is remove plastic valve and replace it with proper shutoff. Hot water tank has male 3/4″NPT behind plastic valve. Is it possible to remove these plastic valves and replace them?
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I replaced mine with a ball valve on a 4" nipple, to get the valve out past the fiberglass blanket the previous owner had wrapped around the heater. I've been quite pleased with it.
Might be a bit of grunge in that plastic valve. You could connect a garden hose and backflush it in hopes of dislodging some rust or sediment (you'd have to close of the HWH fill pipe and open a hot fixture in order to backflush).
Or maybe that cheap valve has failed. Then definitely, replace it with a real, brass valve.