The Supertech valve stem seal pack contains eight 6mm Viton seals with a 12.2mm outer diameter. These are replacement valve stem seals intended for use during engine rebuilds or routine valve-service maintenance to help control oil flow past valve guides. They are supplied as a matched set in the size specified in the product title for appropriate applications.
Supertech 6mm Valve Stem Seal OD 12.2mm Viton - Set of 8