The Heart of Your Pump: Understanding Pump Intake & Exhaust Valves & Their Failures At Master Tool Repair, we talk to customers every day who are frustrated by a compressor that just i … read more Mar 19, 2026 By Craig Coffey, Owner Technical; Review by Eric Trotman, 20-Year Air Compressor Expert
Boost Efficiency: The Benefits of Quick-Connect Couplings Have you ever found yourself wrestling with threaded fittings while trying to swap out air tools, lo … read more Mar 11, 2026 Craig Coffey, Owner; Technical Review by Eric Trotman, 20-Year Air Compressor Expert
Description Specifications Fits Models 0 Reviews Description Rolair Motor Pulley Groove: Single-A Bore: 3/4" Outside Diameter: 4-5/16" View AllClose Specifications Model Number/ Cross Reference: 4090HK17, 6590HK18,5GR30HK17, RC4HK12 Groove: Single-A Bore: 3/4" Outside Diameter: 4-5/16" View AllClose Product Fitment View AllClose 0 Reviews View AllClose
