CxC Isolation Valve 1/2" Screwdriver Operated Nickel plated brass Fitting instructions included Bleeds air from water systems Easy to fit Easi Plumb 1/2" Screwdriver Isolation Valve | Ep15ivs The Easi Plumb Screwdriver Operated Isolation Valve is a straight nickel plated valve which is fitted in-line to enable air to be bled from a water system. This screwdriver operated valve is nickel plated and full fitting instructions can be found on the back of the packaging.