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The Serpent Arms GX CS4 is a portable PCP air compressor for filling air rifle and air pistol tanks. It uses a 350W motor and four-stage compression to reach 5800 psi, with a water tank and grease tank on top for cooling that the maker rates for up to 5 hours of continuous running. It fills a 0.5L tank from empty to 4500 psi in about 14 to 16 minutes and a 6.8L cylinder in roughly 2 hours 40 minutes. It suits shooters who want to top up tanks at home or from a car battery instead of hauling a scuba tank to a dive shop; it is heavier and slower than a full shop compressor but far more portable.
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The Serpent Arms GX CS4 is a portable PCP air compressor with a 350W motor and four-stage compression. It fills to a maximum of 5800 psi (40 MPa) and runs at 70 dB. A double-pointer pressure gauge shows pressure, and a two-level auto-stop pressure setting can be used.
A water tank and a grease tank sit on top of the unit. Water cooling plus a fan allow 4 to 5 hours of continuous work, and it fills cylinders up to 6.8L. A built-in oil-water separator never needs replacing. For first use, fill the water tank with 500 ml of neutral distilled water with no minerals or other impurities, or with antifreeze with a pH of about 7. Use antifreeze if the water may freeze in your area.
It runs on a 12V DC input from a car battery or from a household outlet through the included 110V-12V converter. Do not turn the grease knob until after 4 to 6 hours of use, then turn it one turn. Turn it again if the speed slows. No more grease is needed after the break-in period. When filling is done, release the bottle valve first if you are filling a bottle. Then open the compressor's bleed valve to release line pressure. All pressure must be released before starting. Read the user manual before turning it on.
