Backflow preventer

Dezincification-resistant brass, brass version,
DN 15 - DN 20: three holes 1/4,
DN 25 - DN 50: four holes 1/4,
all of which are sealed with a sealing screw 2 0273 09.
Threaded sockets on both sides according to ISO 7/1. Draining possible, draining valves must be ordered separately.
Non-rising spindle, spindle sealing via elastic double O-ring, upper part sealed via O-ring seal in the body. Seals made of physiologically-safe material.
Volumetric flow class VB, valve group I, according to ÖNORM EN 1213.