Brownall Two Way 180° Drop Lever Gas Tap for excellent on/off indication. Comes with all fittings for bench mounting or other horizontal surface. The tap has a flange diameter of 39mm. SPECIFICATION. Outlet Connections: Fixed serrated nozzles suitable for 8 mm to 13 mm ID rubber hose. Inlet Connection: 1/4' BSP shank by 65mm. Construction: Fire safe plug cocks of brass constructed using grease suitable for Natural Gas and LPG. Installation. Supply pressure should be in the range from 1.5 kPa to 5 kPa. Connection. Fitting connection is a 1/4' BSP male threaded shank 65 mm long. The connection end of the shank is designed to fit 8mm BS 27871 Table X tubing using a compression nut.