| Shipping | Tax | Terms Shopping Cart 0 Items Request for Quote 0 Items All Categories > Clean Air Treatment > Regulators > Wilkerson Regulators > Wilkerson R21 Regulators > View Items Download PDF Download PDF Printable Page Email This Page Save To Favorites Please wait… Wilkerson R21 Regulators Check up to five results to perform an action. larger image Standard FeaturesBalanced Valve DesignNon-Rising Pressure Adjusting DialHigh-Relief Flow (3/16" Relief Orifice)Two 1/4" Gauge PortsPiston Operated Maintain Your Air Compressor Learn more about maintaining your air compressor by downloading our eBook on air compressor maintenance. Download eBook