GX Pump GX CS4-I
Specifications
- Max pressure
- 5,800 psi (400 bar)
- Cooling
- water + fans (onboard tank; add antifreeze in freezing climates)
- Moisture handling
- separator; grease pot, ~every 4-6 hours of use
- Auto-stop
- Yes
- Duty cycle
- 5 hours continuous per manufacturer; owners report no overheating on large tank fills
- Noise
- 70 dB
- Vessel guidance
- Fills carbon fiber tanks; the strongest tank-fill claim in the GX portable range
- Also sold as
- GX E-CS4-I
Estimated fill times
| Vessel | 0 → 250 bar | 200 → 300 bar |
|---|---|---|
| gun cylinder 0.3L | 5.5 min | 2.2 min |
| 1L bottle | 18.3 min | 7.3 min |
| 2L bottle | 36.7 min | 14.7 min |
| 3L bottle | 55 min | 22 min |
| 6.8L (74ci) tank | 124.6 min | 49.9 min |
| 9L (97ci) tank | 165 min | 66 min |
All values estimated from stated manufacturer or reviewer benchmarks (1 benchmark); 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.