Rubber SUCTION CUP HEADS for Valve LAPPING PNEUMATIC Tool Lapper 4 Rubber Heads For - Pneumatic Valve Lapping Tool The Set Includes 4 Rubber Suction Heads Diameter - 16mm , 20mm , 30mm , 35mm For Valves Diameter Up To 45mm The Rubber Suction Heads Are Used With The Pneumatic Valve Lapping Tool