A QR1-type quick release valve with a 3/8" NPT supply port and crack pressure of 0 PSI. Used in a truck's air brake system, it's typically mounted near the brake chambers to allow rapid local exhaust of air rather than routing it back through a long air line, speeding up brake release and reducing lag in the system. It's a Bendix QR-1 style aftermarket replacement, cross-referenced to Bendix numbers 229859 and 288251, Midland KN32005, and International 1676706C1.
