Medium Duty GX Pump
GX Pump CS4
5,800 PSI max · Water + fan cooled
12V120V Auto-stop
Water-cooled, 4-stage, 350W, 5800 PSI. Auto-stop, hour meter, rated for 5 hours continuous. 12V with a 110V converter included.
GX Pump 5K2
Dual-piston, 4-stage, 1200W, 5800 PSI. Fills a 6.8L tank in about 45 minutes. Rated for 10 hours continuous. Sold direct by GX.
Overview
The top of the GX lineup. Two pistons and 4-stage compression, driven by a 1200W motor on 110V, reach 5800 PSI (40 MPa). GX says it handles almost any PCP, paintball, or HPA tank, even over 20L, and fills a 6.8L tank from empty to 4500 PSI in about 45 minutes. A sealed water tank with a pump plus a high-power fan let it run up to 10 hours continuously. The big shock-resistant gauge has twin set arms for two-stage auto-stop, and it bleeds off moisture automatically when a fill finishes. GX's pitch: hook up, press start, and go eat dinner. It also has an hour meter, a grease injection system, and casters. Before the first start, fill the cooling tank with about 500 ml of automotive coolant, and don't turn the grease knob for the first 6 hours. GX lists an 18-month warranty and about 106 lb shipping weight. Sold direct by GX in the USA.
"This is a fill station, not a portable. If you're filling big tanks every week, or filling for a whole club, this is the GX to look at."
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Medium Duty 
Medium Duty GX Pump
GX Pump CS4-I
5,800 PSI max · Water + fan cooled
12V120V Auto-stop
The CS4 with the 110V converter built in. Water-cooled, 4-stage, 350W, 5800 PSI, auto-stop, 5 hours continuous. Roger's champion pick.
Medium Duty GX Pump
GX Pump 5K1
5,800 PSI max · Water + fan cooled
120V Auto-stop
The single-piston 5K2. 4-stage, 900W, 5800 PSI, auto-stop, 10 hours continuous. Sold direct by GX.