FEATURES UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" FREE-FLOATING PISTON TYPE VALVES REDUCE O-RING WEAR. EXTRA ACCESS PORT FOR VACUUM LINE. SILICONE DAMPENED GAUGES SMOOTH OUT NEEDLE MOVEMENT. GAUGES CAN BE EASILY RECALIBRATED IN THE FIELD TO MAINTAIN ACCURACY. EXTRA LARGE SIGHT GLASS FOR VISUAL REFRIGERANT CHECK. LARGE EASY-TO-GRIP KNOBS.