When you're outfitting shop air, the first question isn't 'which compressor is best'-it's 'which piece do I actually need?' These four listings show how different the answers can be: an all-in-one option, a big storage tank, a new component for a custom build, and a repair project.
Quick Take
If you need a compressor you can put to work right away, the Industrial Air CTA6590412 is the only unit in the group that's sold as a ready-to-run compressor, but it's open box and sold without a warranty. If you already have a compressor and just need storage, the HPDAVV receiver tank is the largest-capacity item here. If you're piecing together a custom setup, the Sanborn pump is the component route. And if you're comfortable with a project, the Quincy QR5120 is priced highest but explicitly sold as-is with a knocking condition.
Listed Price Comparison
| Product | Listed Price | Price Bar |
|---|---|---|
| Industrial Air CTA6590412 4 Gallon Gas Portable Air Compressor | $524.99 | |
| SANBORN 2-Stage 5HP Air Compressor Pump | 17 CFM | $790.00 | |
| Industrial Air Compressor Receiver Tank Vertical Horizontal ASME 270 Gallon | $1,999.00 | |
| Quincy BM5120ST QR5120 Industrial Air Compressor | Knocking | Needs Repair | $2,500.00 |
Decision Matrix
- Need a ready-to-run compressor? The Industrial Air unit is the only self-contained compressor in this set.
- Need to add air storage? The HPDAVV receiver tank is the clear storage play.
- Need a replacement or build pump? The Sanborn pump is a reciprocating option.
- Want to take on a repair? The Quincy BM5120ST is listed for parts or not working, so it's for someone who wants to diagnose and rebuild.
Product Notes
Industrial Air CTA6590412 4 Gallon Gas Portable Air Compressor Kohler 6.5HP
This is the only complete, ready-to-run compressor in the comparison. The Kohler 6.5HP 196cc gas engine and 155 PSI maximum pressure make it a genuinely portable unit: the listing calls out portability, and the tank capacity is split across two 2-gallon tanks for a total of 4 gallons. The catch is condition. It's listed as open box, with general wear from previous transit and warehouse storage, and the manufacturer warranty is listed as 'No warranty.' If you want a gas-powered portable compressor at $524.99 and are comfortable with visible wear and no warranty, this is the option.
Industrial Air Compressor Receiver Tank Vertical Horizontal ASME 270 Gallon
The HPDAVV 270-gallon receiver tank is not a compressor-it's the air-storage half of a larger system. It's new, made of carbon steel, rated to 160 PSI, and the description notes ASME Section Code design and 1", 2", and 3" NPT connections for installation flexibility. The listed price is $1,999.00. If you already have a compressor head or screw machine and need a substantial 270-gallon tank, this gives you that capacity. The trade-off is that the tank alone won't produce air; you're buying storage, not a complete compressor, and you'll need the rest of the system around it.
Quincy BM5120ST QR5120 Industrial Air Compressor - Knocking - Needs Repair
This Quincy is the most expensive listing at $2,500.00, but it's also the only one explicitly sold for parts or not working. The description says it was removed from service after developing a knocking noise, a technician inspected and re-tightened the valves, the knocking remained, and the recommendation was to replace the pump. The exact internal failure is unknown, and the unit has not been disassembled or rebuilt. If you're looking for a repair/rebuild project or need source parts from Quincy, this could be worth investigating. The limitation is significant: you should assume the pump needs repair or replacement before the compressor can run again.
SANBORN INDUSTRIAL AIR 2 STAGE 5HP AIR COMPRESSOR PUMP 17 CFM SC23 / 040-0211
The Sanborn 5HP 2-stage pump is a new reciprocating pump rated at 17 CFM, listed at $790.00. If you're building your own compressor or replacing a worn pump, this gives you the pump itself with the model listed as SC23 / C521E80 / C580 and a 5HP motor horsepower. Because it's a pump rather than a complete compressor, keep that in mind for your build. For a new, pump-only route in a custom build, the $790.00 price sits between the smaller compressor and the receiver tank.
Final Recommendation
If you want one item that's ready to use immediately, choose the Industrial Air CTA6590412 and accept the unit's as-is condition. If you're building or expanding a stationary system, start with the Sanborn pump if you need air delivery, and add the HPDAVV receiver tank if your priority is storage. The Quincy BM5120ST only makes sense if you're ready to take on the repair route and want to work from a Quincy compressor platform.
