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Water Valve Seal

Black Cat

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Just received my new heater control valve and it came with a fiber gasket for the flange joint, when I removed the old one it had an ‘O’ ring sealing (Item 78 in the attached) and no gasket. Do I need the ‘O’ ring if I’m using the fiber gasket and if not should I also use some sort of gasket sealer with the fiber gasket? The old ‘O’ looks a bit shot away.

Heater control valve..jpg

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