12 in. Bayonet Inflator Gauge Hose Whip Replacement Milton's S-527 is the replacement hose whip for the Milton bayonet inflator gauge #522. With 1/4 in. NPT threads, this 12 in. bayonet inflator gauge hose whip is compatible for use and connection with any of the 4 Milton Bayonet Inflator bodies: #520, #521, #522 and #523. Offers 10 psi to 120 psi or 80 kPa to 840 kPa. The air chuck has 1/8 in. -27 NPT threads. This hose whip is free-flowing and cannot be used without the Bayonet Inflator Gauge- Air is turned on/off by the bayonet controller. If connected directly to an air source, air will constantly flow out. Other replacement parts: S-527 replacement air chuck: Milton #500-4.