Syr Sicherheitsgruppe 25 SYRobloc DN 20, G3 / 4 10bar raw yellow SYRobloc- Sicherheitsgruppe 25, for connection of closed DHW Sicherheitsgruppe according to DIN 1988. Consisting of: Shut- Sicherheitsgruppe valve, backflow preventer with test device, second shut-off valve (only DN 20), membrane safety valve, new, extendable discharge funnel and mit Druckminderer , outlet mit Druckminderer adjustable from 1.5 to 6 bar. Factory pre-set to 4 bar housing made of pressed brass, cap of safety valve made of fiberglass-reinforced plastic. Seat of stainless steel safety valve. DN 20, 10 bar, gland G 3/4, rg. Component tests: DIN-DVGW tested, TÜV-SV-10-545, sound insulation test number PA-IX 1794 / I.