NON RETURN VALVE GA 015, GB 015, GB 019 – Little dimensions and low weights. Face to face acc.to DIN EN 558-1 Series 49 (DIN 3202 K4). Opening pressure from 20 to 500 mBar. Usable also as vacuum breacker, overpressure and bottom valve. No leackage with soft seat and acc.to DIN 3230 BN3 with metal seat. Low head losses.