GX PUMP GX-E-CS4 Portable PCP Air Compressor – 350W, 5800 PSI, Water-Cooled, 5 Hours Run Time, 12V Auto Stop

Meet GX PUMP GX-E-CS4: Portable PCP Air Power

Designed for air enthusiasts who need reliable high-pressure air on the go, the GX-E-CS4 blends a four‑stage compression system with a water‑cooled chamber. Driven by a genuine 350W motor, it balances solid performance with quiet operation, keeping noise around 70 dB so you can fill cylinders without distracting your workflow.

Key design features that stand out

The unit features a dual‑pointer pressure gauge and two‑level auto‑stop for clear, safe control as you approach target pressures. A compact water tank and a dedicated grease reservoir help manage cooling and lubrication, supporting longer sessions and more consistent fills.

• Four‑stage compression for stable high‑pressure output
• Integrated water‑cooled structure to maintain steady performance
• Quiet operation with a 70 dB sound footprint
• Dual‑pointer gauge and auto‑stop offer precise, safe fills

Real‑world use and performance

In practical terms, PCP setups benefit from meaningful efficiency gains during small‑volume fills. For example, filling a 0.5 L tank from 3000 psi to 4500 psi takes about 4–5 minutes, and a 0–4500 psi fill for the same volume takes roughly 14–16 minutes. A larger 6.8 L cylinder can reach 4500 psi in about 2 hours 40 minutes. The system supports up to about five hours of continuous operation under ideal cooling, making it suitable for extended sessions without frequent pauses.

• 12V DC input supports car battery or household outlet via the included converter
• Built‑in oil‑water separator reduces maintenance needs for everyday use
• Compact footprint: 11.8 × 6.1 × 12.4 inches; weight ~29 lb

Setup tips and safety notes

For the first use, fill the cooling circuit with about 300 ml of antifreeze to protect internal pathways; neutral antifreeze is advised in colder areas. Do not turn the grease knob during the first 4–6 hours of operation. After each fill, close the bottle valve, then vent the line to release pressure before the next cycle. For best results, follow the manual and consider a GX external filter if you need enhanced filtration performance.