Danco 10-Pack 1-1/4-in x 1/8-in Rubber Faucet O-Ring in the Faucet O-Rings department at Lowes.com
Ideal Vacuum | ASA 6 Inch Blank Flange with O-Ring Groove, Not Bored, Not Rotatable, 11 in OD, 9.5 BCD, 0.81 in Hole Diameter, 8 Holes, 304 Stainless Steel