The Bendix QR-1 Quick Release Valve, part number 801523, is a genuine Bendix air brake valve designed for heavy-duty truck air brake systems. Quick release valves exhaust air pressure rapidly from brake chambers or other actuators, reducing brake release time and improving brake response. This valve is sold individually and is sourced directly through Pro Gear and Transmission. Call us to confirm proper fitment for your specific truck or trailer application.Interchanges:85151444BW801523BX801523A factory handling fee of $20.00 per unit is added at checkout.FeaturesGenuine Bendix QR-1 Quick Release ValvePart number 801523Designed for heavy-duty truck air brake systemsReduces brake release time by rapidly exhausting air pressure from brake chambersSold as individual unit