GX Pump CS4-I

Overview

Everything the CS4 does, with the 110V-to-12V converter built in. Plug it into the wall or clip it to a car battery, with no separate power brick. It's a real 4-stage compressor with a built-in water-cooling loop and a 350W motor, and it reaches 5800 PSI (40 MPa). GX rates it at 70 dB and up to 5 hours of continuous running. It has a dual-needle gauge, two-level auto-stop, an hour meter, and a built-in oil/water separator. Before the first run, fill the coolant tank with neutral (pH 7) distilled water or antifreeze. Use antifreeze if it freezes where you live. Turn the grease knob one turn every 6 hours of running, but not before the first 6. GX says the CS4-I is meant for small high-pressure tanks up to 6.8L, not large cylinders. For those, they point to the 5K series. It weighs 29 lb and uses an M10x1 / 8mm quick connector. In the box: the compressor, fill hose, 12V DC cable, AC cable, and manual.