B-12 Chemtool, 10 OZ, Carburetor & Choke Cleaner, Dissolves Gum & Varnish From Carburetor, PVC Valve, Automatic Choke, Carburetor Linkage & Distributor Shaft With High Energy Solvent Technology, Improves Drivability By Removing Deposits That Cause Rough Idle & Stalling.