Why Is My Isolation Valve Leaking from the Centre Screw?Expert advice from Afterglow – leading plumbers in BirminghamAn isolation valve is a small but essential part of your plumbing system, allowing you to shut off water to taps, toilets, boilers or appliances. One of the most common issues homeowners face is an isolation valve leaking from the centre screw. Once it starts dripping, it rarely stops without intervention.Why Isolation Valves Leak from the Centre Screw1. Worn Internal Washers o...