GX Pump GX CS3-I
Specifications
- Max pressure
- 4,500 psi (300 bar)
- Cooling
- fan
- Moisture handling
- built-in water-oil separator filter
- Auto-stop
- Yes
- Duty cycle
- GX's own product page states two different duty-cycle figures in different sections: 30 min run / 20 min cool in one place, and 50 min run / 20 min cool in another, for what appears to be the same unit. Both are reported rather than picking one, pending clarification from GX; the more conservative 30/20 figure is the safer one to plan around.
- Vessel guidance
- Designed mainly for vessels under 1L; can fill up to 1.5L with cooling pauses, though that isn't the primary design intent
- Also sold as
- GX-E-CS3-I
Estimated fill times
| Vessel | 0 → 250 bar | 200 → 300 bar |
|---|---|---|
| gun cylinder 0.3L | 9.5 min | 3.8 min |
| 1L bottle | 31.8 min | 12.7 min |
| 2L bottle | 63.6 min | 25.4 min |
| 3L bottle | 95.4 min | 38.2 min |
| 6.8L (74ci) tank | 216.3 min | 86.5 min |
| 9L (97ci) tank | 286.3 min | 114.5 min |
All values estimated from stated manufacturer or reviewer benchmarks (3 benchmarks); treat as run-time, not wall-time, past the unit's duty-cycle guidance.
Where to buy
Prices captured 2026-07-06; follow the link for current pricing and stock.
About GX Pump
GX Pump has spent two decades building portable PCP compressors, and it shows in the details that matter: patented compression structures, roller bearings at the wrist pin, and a model range that runs from the entry CS1 up to the water-cooled CS4 with its five-hour continuous duty rating. The -I variants build the 110V converter into the body so one unit covers home outlets and car batteries alike. GX also backs its machines with a genuinely useful parts store, offering filters, seals, fans, and rebuild components that keep these compressors serviceable for years.
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Open my locker →Specifications come from manufacturer pages and named retailer listings; blanks mean a value wasn't published, not that it's zero. Fill-time figures are derived estimates, not lab measurements. Always follow the manufacturer's fill and duty-cycle guidance.