Up for sale this week. A new Rol-Air K28 2-stage compressor with flywheel. Part # PMP22K28CH or K28. As always, thank you for viewing our listings. Make sure to check out our store for more great deals. PMP22K28CHTHIS TWO STAGE PUMP WILL FIT OR REPLACE MOST BRANDS. CAST-IRON CYLINDER AND ALUMINUM-STANDARD FLYWHEEL COMES W/ 15.16? OD FLYWHEEL AND AIR FILTER.