Medium Duty Yong Heng
Yong Heng LCD Auto-Stop
4,500 PSI max · Water-cooled (external bucket)
The classic Yong Heng design with an LCD gauge and auto-stop. 110V, two-stage, fast, but it needs an external bucket of cooling water.
Compressors / By Cooling
Water Cooled PCP Compressors
Coolant circulates through a jacket around the pump. Heavier and pricier, but it can run for hours and fill bigger tanks without cooking itself.
Own a water-cooled compressor? Read the coolant guide: what to fill it with, and why it can't sit in a freezing garage.
10 compressors
Narrow it down further → Medium Duty 
Light Duty VEVOR
VEVOR 4500 PSI Water + Fan Cooled, Auto-Stop
4,500 PSI max · Water + fan cooled (coolant tank on top)
VEVOR's portable with a coolant tank on top plus a 12,500 rpm fan. 4500 PSI, auto-stop, 600W converter, 12V or 120V.
Light Duty VEVOR
VEVOR 2200W Dive Compressor, Dual-Cylinder
4,500 PSI max · Water + fan cooled (external bucket)
VEVOR's scuba-style compressor: 2200W dual-cylinder, 35 L/min, carbon + molecular-sieve filtration, external water cooling, oil-lubricated.
Light Duty Tuxing
Tuxing TXEDM042 2.2kW Two-Stage Filtration
4,500 PSI max · Water + fan cooled (external water supply)
Tuxing TXEDM042: 2.2kW two-stage compressor, 50 L/min, two-stage filtration, auto-stop, external water + fan cooling. Oil-lubricated.
Light Duty Tuxing
Tuxing TXEDT032 Scuba, Built-in Water + Fan Cooling
4,500 PSI max · Water + fan cooled (built-in reservoir, triple fans)
Tuxing TXEDT032 scuba compressor: 50 L/min, built-in water reservoir with triple fans (no bucket), two-stage filtration with carbon and molecular sieve.
Medium Duty GX Pump
GX Pump CS4
5,800 PSI max · Water + fan cooled
Water-cooled, 4-stage, 350W, 5800 PSI. Auto-stop, hour meter, rated for 5 hours continuous. 12V with a 110V converter included.
Medium Duty GX Pump
GX Pump CS4-I
5,800 PSI max · Water + fan cooled
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
The single-piston 5K2. 4-stage, 900W, 5800 PSI, auto-stop, 10 hours continuous. Sold direct by GX.
Medium Duty GX Pump
GX Pump 5K2
5,800 PSI max · Water + fan cooled
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.
Medium Duty GOYOJO
GOYOJO AC3
5,800 PSI max · Water + fan cooled
GOYOJO's water-cooled 5800 PSI machine: 350W 4-stage, dual-pointer auto-stop, external grease pot, built-in converter. A close match to the GX CS4-I.