for single-line systems with return line, with quick-closing shut-off valve and double O-ring seal, with vent valve for commissioning, brass body and union nut, with mounting bracket, transparent cup for suction operation, connection thread on the tank side G 3/8" Female thread for clamping ring connection 6, 8, 10 or 12 mm, burner side G 3/8" male thread with internal taper for hose connection, max. operating temperature 40 °C