Rolair 8422K30 Two Stage Pump With Flywheel Air Compressor System

Rolair 8422K30 two-stage pump with flywheel is a replacement pump designed to drop into Rolair’s 8422K30 and 8422HK30 wheeled gas air compressors, restoring their two-stage, flywheel-driven pumping capability and allowing technicians to refresh worn pump assemblies without replacing the entire unit. This II Stage Pump with Flywheel is cited in Rolair schematics as part of the K30 series and is offered as an OEM pump with a straight shaft, intended for twin-tank assemblies and compatible with Rolair's standard mounting interfaces. The flywheel is multi-fin and measures 15.16 inches in diameter, a design element that contributes to smoother torque transfer and stable engine/pump interaction during operation. Rolair markets the 8422HK30 variant as the largest portable two-stage unit in its class, delivering up to 20.1 CFM at 90 PSI, illustrating the high-end performance these pumps are built to support in professional shop or job-site settings.