Milton (S-520) Bayonet Tire Inflator Gauge - Straight Air Chuck Head, 120 Max PSI 1/4" NPT. Air chuck threads: 1/4" Barb. Pressure range of PSI (10-120) and kPa (80-840). Includes: Bayonet-style inflator gauge, Straight head air chuck, and 12" Hose. Replacement hose whip: Milton #528. Replacement air chuck: Milton #P500-45. All Milton replacement hose whips have 1/4 NPT threads and are interchangeable with any Milton bayonet gauge.