KF-16 O-ring features a depth stop for clamping with Viton O-ring KF-25 O-ring features a depth stop for clamping with Viton O-ring KF40 O-ring features a depth stop for clamping with Viton O-ring also fits NW40 high vacuum connections KF50 O-ring features a depth stop for clamping with Viton O-ring also fits NW50 high vacuum connections

O-ring features a depth stop for clamping with Viton O-ring also fits the following high vacuum connections.