The Campbell Hausfeld E110540 12" Air Compressor SVC Flywheel W/Bolt I11 helps deliver smooth and efficient compressor operation for compatible air compressors. It works by storing rotational energy and transferring power from the motor to the compressor pump, helping maintain consistent performance while reducing vibration during operation. Made to replace a worn, cracked, or damaged... https://www.wholetoolbox.com/campbell-hausfeld-e110540-12-air-compressor-svc-flywheel-w-bolt-i11/E110540.html