Description Small vacuum gauge for portable pumps. Glycerin filled to reduce vibration. 2.5 inch diameter face Threaded for 1/4 inch NPT Vertical Mount only Stainless steel back 0-30 inch range 55AC Replaces 67224 Note; once mounted, pull pin to remove air pressure and check that needle goes to zero. Hamby Dairy Supply offers 3 options for gauges; 7126 - 2.5 inch for portables (this item) 7135 - 3.5 inch for vacuum line mount 7145 - 4.5 inch for vacuum line mount Mounting adapters - shown below; ReducerBushing.5x.25 - Reducer Bushing 1/2MPT to 1/4 FPT 7009-3270-050 - Metal Mount with Female NPT for vacuum gauge, drain or pulsator. Fits 2.0 inch PVC 01/26