A-B1690968-AI SEAL-VALVEOne New Aftermarket Replacement Valve Seal (Seal Valve) Fits Briggs & Fits Stratton Small Engines This aftermarket replacement valve seal (also called a valve stem seal or intake valve seal) installs on the intake valve stem inside the cylinder head, seating beneath the valve spring. It prevents oil from migrating past the valve stem and into the combustion chamber, stopping oil consumption and blue exhaust smoke at startup. This part Fits Briggs &