A-B1396795-AI KIT-NEEDLE VALVEOne New Aftermarket Replacement Needle Valve Kit Fits Briggs and Stratton (B&S) Small Engines This carburetor needle valve kit is a fuel system repair part Fits Briggs and Stratton (B&S) L Head small engines. The needle valve controls fuel flow into the carburetor float bowl; a worn or leaking valve causes rough running, fuel overflow, and poor throttle response. This kit includes the needle valve and seat to restore proper carburetor function on lawn