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Leaking stem on Tankless service valve

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Jon_23
Jon_23 Member Posts: 8
in THE MAIN WALL

I have a tankless hot water heater. After a descaling some months ago, the hot service valve stems now drips on occasion (very slowly). The valve opens and closes fine, and there is no packing nut or anything to tighten or adjust. I know I should just get this valve replaced, but as you can see from the photos below, there is a lot going on nearby (including the pressure relief valve).

Anybody have a 'trick' to get this stem to stop dripping. Again it is intermittant and very, very slow…

Thanks. Jon

V1.jpg

V2.jpg

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