63 mm Autofill Gauge with M5 connection. To change the gauge on new or existing Autofill pressurisation units, the AA032 gauge would need to be used with the FSE4-M5 Swivel Elbow and FTUB4-2.7BL Nylon Tubing (both available to buy online). Please note, M5 connection used on Autofill units after November 2004.