Ideal Vacuum | ISO 100 Centering Ring Stainless Steel with Viton O-Ring No Spacer, NW-100 Vacuum Flange Size, Typically Used with 4 Inch O.D. (101.6 mm) Tubing
Faucet O-Ring Disk and Spacer Kit (Blister Pack 100)
SBC Valve Cover O-Ring O-Ring Spacer - Neil & Parks