Milton (S-522) Bayonet Tire Inflator Gauge Milton (S-522) Bayonet Tire Inflator Gauge - Dual Truck Tire Chuck Head, 120 maximum psi Miltons #522 Dual head chuck bayonet gauge specializes in reaching dual truck tires. It has lever action and is made with heavy-duty construction, providing long service life even with constant use. Valve and gauge cartridges are replaceable and combined in 1 easy unit. Includes a 12 in. hose with a pressure range that offers 10 psi to 120 psi (2 lbs. increments) or 80 kPa to 840 kPa (20 kPa increments). The air chuck has 1/8 in.-27 NPT threads. Complete with a jumbo white nylon indicator bar for easy reading. With 1/4 in. NPT threads, all Milton hose whips are compatible for use and have interchangeable connections with any of the 4 Milton Bayonet Inflator Gauge bodies: #520 (straight chuck head), #521 (single chuck head), #522 and #523 (grip chuck head to lock onto valve). Recommended Replacement Parts: S-522s replacement air hose whip: Milton #527 (12 in. hose whip with/dual truck tire chuck head). S-522s replacement air chuck: Milton #500-4. Replacement cartridge for #520-523: Milton #525.