1) Piloted check valve HGL Shut-off valve with manual override option. Valve function: piloted non-return function Screw-in with male thread Pneumatically piloted Pilot air connection: M5, G1/8, G1/4, G3/8, QS-4 Manually actuated exhaust possible with separate accessory 2)Piloted check valve VBNF Flat, rotatable shut-off valve with manual override option. Valve function: piloted non-return function Minimal height High flow rate Can be rotated horizontally through 360° in assembled state Manually actuated exhaust possible 3) Check valve H, HA, HB Screw-in check valve. Valve function: non-return function Screw-in or in-line installation With connecting thread at both ends, push-in connector at both ends, thread/push-in connector