and any rubber you do see is synthetic also.Compare. Kohler Rubber O-Ring Seal Kit 1 pk. 2 Reviews. $8.99 8.99 $. Free Store Pickup Today. Select 2 or more products for side-by-side feature comparison. Compare. Culligan 5-3/4 in. D X 5.43 in. D Rubber O-Ring 1 pk.O-Ring Seal Kit for Kitchen Faucets in White. Model# K-GP30420 (124) $ 7 48. DANCO #9 O-Ring (10-Pack) Model# 96726 (9) $ 2 92. DANCO #8 O-Ring (10-Pack) Model# 96725 (10) $ 2 92. DANCO #18 O-Ring (10-Pack) Model# 96735 (17) $ 2 92. DANCO #11 O-Ring (10-Pack) Model# 96728 (5) $ 2 92. DANCO #12 O-Ring (10-Pack) Model# 96729 (4) $ 2 92. DANCO O ...Viton® O-Rings. and seals are made from a fluoroelastomer which is well known for its excellent (200°C) heat resistance. Viton® offers excellent resistance to aggressive fuels and chemicals and has worldwide ISO 9000 registration. General use grades of Viton® fluoroelastomer are denoted as A,