Range of 12, 18, 20, 24 spline Teeth Traditional Compression Tap Valves. The Rubber Washer Full Turn Screw Down Style Tap glands suit a range of kitchen and basin taps. BSP 1/2" for traditional taps and crosshead taps. If your traditional compression taps are leaking you need to replace the valve. As well as BSP 1/2" and 3/4" we also have the Older BS1010 Threaded valves. These have wider threads than modern BSP threads. The 12 spline valves suit older style taps from brands such as Bristan, Beaumont, Aqafix. We also have a long tall chrome stem gland available. Also known as a headwork