Vacuum Pipe Fittings/Center Ring with O-ring Seal | MISUMI | MISUMI Thailand
_BMT_ KF-25 NW-25 Vacuum Center Ring Made of SS304, O-Ring = Silicone (lot of 10pcs): Amazon.com: Industrial & Scientific
Manufacturer's Direct Sales Vacuum Center Support Clamp Sealing Ring Kf Series Vacuum Accessories FKM O-Ring Rubber Sealing Ring - China O-Ring Seal, Rubber Seal | Made-in-China.com