A-B1692279-AI SEAL-THROTTLE SHAFTOne New Aftermarket Replacement Throttle Shaft Seal Fits Briggs and Stratton Small Engines This throttle shaft seal fits the carburetor throttle shaft on Fits Briggs and Stratton (B&S) small gasoline engines. Seated at the throttle shaft bore on the carburetor body, the seal prevents air leaks around the shaft, blocks dirt and debris from entering the carburetor, and helps maintain the correct air to fuel ratio for smooth, consistent engine operation.