Set of 4 NW/KF-25 Clamps with Centering O-Rings, Aluminum, Vacuum Part: 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 and Rubber Seal
Quick Clamps | O Ring Clamp Joint | Xtractor Depot
Ideal Vacuum | NW KF-16 to 15mm ID Glass O-Ring Joint Adapter, Stainless Steel, uses No. 28 Joint Clamp SS
Amazon.com: HPS Performance Stainless Steel 2-1/2"" (63mm) V Band Clamp Kit, Aluminum Flanges, NBR O-Ring, Quick Release : Automotive
GSC Go Science Crazy Support Ring Clamp Support ring, 3 in. od:Clamps and | Fisher Scientific