CASTAIR 1.5HP 4GAL DIRECT DRIVE PORTABLE ELECTRIC AIR COMPRESSOR FEATURES: REGULATOR WITH GAUGE MOUNTED & QUICK COUPLER UP TO 10 TIMES THE LIFE OF OIL-LESS UNITS FAN COOLED THERMAL OVERLOAD PROTECTED MOTOR FILTER/SILENCERS PROVIDE CLEAN AIR AND QUIET OPERATIONS HEAVY DUTY PRESSURE SWITCH WITH ON/OFF CONTROL & COPPER BLEEDER TUBE HEAVY DUTY OIL LUBRICATED WITH CAST IRON SLEEVE PUMP FOR LONG LIFE FINNED COPPER DISCHARGE TUBE FOR STRENGTH & INCREASED HEAT DISSIPATION ASME-SAFETY VALVE INSTALLED, 8 GAL SINGLE TANK UNITS ARE NON-ASME TWO PIECE CONNECTING ROD, INDEPENDENT WRIST PIN, & A REAL PISTON WITH 3-RINGS