Milton (523) Bayonet Tire Inflator Gauge - Grip-Style Air Chuck Head to Lock onto Valve, 120 Max PSI 1/4" NPT. Air chuck threads: 7/16-27 UNS. Pressure range of PSI (10-120) and kPa (80-840). Includes: Bayonet-style inflator gauge, Grip head air chuck to lock onto valve, and 36" Hose. (Milton 520-522 all come with 12" hoses.) Replacement hose whip: Milton #529. Replacement air chuck: Milton #500-43. All Milton replacement hose whips have 1/4 NPT threads and are interchangeable with any Milton bayonet gauge.