Extra confidence: built to last with a forged aluminum body, designed to be leak resistant with replaceable stainless steel valve seats, SAE style O-rings and a securely seated, large sight glass|Quick on the job: get faster vacuum pulls with a true 3/8 in bore throughout the valve|Comfort grip: a rubberized handle makes it easier to use in wet and dirty environments|Glows in the dark: light activated paint illuminates, so one won't be left in the dark|Pressure indicator ring: a pressure reminder allows ones to set the pressure ring and reference it later|Class 1 to 1% accuracy (full scale)|1/8 in NPT male fitting for gauge connection|Double O-ring piston style valve type|Replaceable valve seat of stainless steel