4mm x 20 mm wooden glazing blocks 80mm long

Aluminum pump siphon with special rubber disc (220 mm) for curved and highly structured surfaces. Due to its strongly curved rubber disc, this suction plate on must be pressed firmly onto the substrate to be sucked, only then the air between the substrate and the suction disc is evacuated by means of the pump tappet by actuating the pump tappet. Permanent visual control of the vacuum through the red ring on the pump tappet.