The Rolair 31007280CH Aluminum Flywheel is an 11-inch diameter replacement part for Rolair K17 and K18 air compressor pumps. The part is identified by number 31007280CH and is manufactured from aluminum. Rolair's official parts price list lists 31007280CH as an aluminum flywheel with an 11-inch diameter for K17 and K18 models. Some retailer listings also show compatibility with K3, K8, K11, and K12, though manufacturer documentation specifies the 11-inch aluminum flywheel for K17 and K18. If your unit is a K17 or K18, this is the correct aluminum replacement flywheel.
