Milton (S-522) Bayonet Tire Inflator Gauge - Dual Truck Tire Air Chuck Head, 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, Dual head air chuck, and 12" Hose. Replacement hose whip: Milton #527. Replacement air chuck: Milton #500-4. All Milton replacement hose whips have 1/4 NPT threads and are interchangeable with any Milton bayonet gauge.