Flat face seal
The Illustrated Guide to Hot and Cold Water Services (BG 33/2014), written by Reginald Brown and published by BSRIA in 2014, in states: ‘Flat face seals with fibre or rubber washers are used in tap connectors and some other fittings. Fibre and rubber washers provide a good seal when first fitted but will deteriorate with age especially if disturbed or subject to thermal cycling. They should be considered as limited life replaceable components and replaced whenever the joint is separated or shows external signs of leakage.’
--BSRIA
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