when you look at the specs they all look similar
so maybe some of the numbers are fudged a bit
KEY FEATURES INCLUDE
•Solid PPS Carry Case
•150 Litres/Minute - Extra Volume Air Delivery
•150 PSI Working Pressure - Others are only 100Psi
•Large Displacement Twin Cylinder- Heavy Duty Construction
•Stainless steel valves, PTFE piston rings, Stainless Steel Bolts
•Auto thermal cut-out protection
•Solid base for stability
•Gear less direct drive - quiet and efficient
•Alloy Air pump Assembly - allows for Quick heat dissipation
•Heavy Duty ON/OFF Control
•Coil air hose included with accurate pressure gauge
•Solid Brass Fittings and connectors
•Anti-vibration Design
•Standard NPT Fittings
•Replaceable Air-Filter Element
•Fused (45amp) 2 metre power cable with Alligator Clamps