The Castair PUK5520G is a gas-powered contractor air compressor with a Honda GX160 engine and a 20-gallon portable tank. It delivers 11.6 CFM at 100 PSI — identical output to the PUK5508G — but the larger 20-gallon tank extends run time between motor cycles and reduces the frequency of pressure recovery drops during sustained tool use. At $1,482.40, it costs $15 more than the 8-gallon twin-tank model. The choice between these two units is entirely about tank configuration, not output — same engine, same pump, same CFM.
PUK5520G vs. PUK5508G — Twin Tank vs. 20-Gallon Portable
Both units run the Honda GX160 engine and the same cast-iron belt-drive pump at 1,380 RPM, producing identical CFM output. The 8-gallon twin-tank on the PUK5508G sits lower and is easier to handle in a truck bed or at the base of scaffolding — better for tool mobility on a framing or roofing site. The 20-gallon portable tank on the PUK5520G holds 2.5 times the air volume, which means less frequent motor cycling during sustained tool use — better when you are running a grinder, orbital sander, or impact continuously rather than cycling a nail gun. The PUK5520G is 10 lbs heavier (195 vs. 185 shipped) and taller at 33" high versus 26" on the twin-tank.
Key Specifications
- Engine: Honda GX160
- Tank: 20-gallon portable
- CFM at 0 PSI (free air): 18.6
- CFM at 100 PSI: 11.6
- Pump RPM: 1,380
- Max pressure: 125 PSI (single stage)
- Drive type: Belt drive, oil-lubricated cast-iron pump
- Tank certification: ASME
- Dimensions (LxWxH): 33" x 18" x 33"
- Shipped weight: 195 lbs
- Price: $1,482.40
Features
- Honda GX160 engine: Commercial OHV engine, cast iron cylinder sleeve, pressure lubrication
- Cast-iron belt-drive pump: Long service life, oil-lubricated, not direct-drive aluminum
- Head unloaders: Better cooling and reduced engine load at shutdown versus dump valves
- Finned copper discharge tube: Heat dissipation and durability
- V-cylinder pump design: 360-degree cooling around cylinder heads
- Two-piece connecting rod with independent wrist pin: Proper lubrication and reduced side loading
- Three-ring piston: Oil control, compression, and wiper rings
- Ball bearings at both crankshaft ends: Reduced friction, longer bearing life
- Paper filter/silencer: Clean intake air, quieter operation
- ASME powder-coated tank: Safety valve installed
- Easy-read sight glass: Visual oil level check without removing cap
Gas Contractor Compressor Lineup
- PUK5508G — GX160, 8-gal twin tank, 11.6 CFM @ 100 PSI, 38x18x26", 185 lbs ($1,467.10)
- PUK5520G — GX160, 20-gal portable, 11.6 CFM @ 100 PSI, 33x18x33", 195 lbs ($1,482.40) — this unit
- PUK9008G — GX270, 8-gal twin tank, 18.6 CFM @ 100 PSI, 42x18x28", 250 lbs ($2,329.00)
Technical Specifications
- Model Number: PUK5520G
- Manufacturer: Castair (Cast Air)
- Engine: Honda GX160
- Tank capacity: 20 gallons, portable
- CFM @ 0 PSI: 18.6
- CFM @ 100 PSI: 11.6
- Pump RPM: 1,380
- Drive: Belt drive
- Tank certification: ASME
- Dimensions (LxWxH): 33" x 18" x 33"
- Shipped weight: 195 lbs
- Price: $1,482.40
What's in the Box
- Castair PUK5520G complete gas compressor unit
- Honda GX160 engine installed
- ASME 20-gallon portable tank with safety valve installed
- Paper filter/silencer
- Cast-iron pump with oil
Why Buy From Air Compressor Factory Direct?
We stock Castair gas-powered compressors and can help you choose between the 8-gallon twin-tank and 20-gallon portable configurations based on your actual application. Both run the same engine and pump — the choice is about how you use it in the field. Free shipping on qualifying orders. Full Honda engine warranty and Castair compressor warranty. Call our tech line for pre-purchase questions.
Call 866-217-0063 for quick answers and help!
