You need a serious source of compressed air, but the two options in front of you solve the problem from opposite ends. One is a complete gas-powered portable compressor with its own storage tank. The other is a bare, two-stage pump you'll pair with the rest of your air system. Choosing between them means deciding whether you want a ready-to-run unit or a component for a setup you already have.
Quick Verdict
Go with the AllMetal 40 Gal 9HP Gas Air Compressor if you need air where there is no electrical service. Its 9HP OHV gas engine, large ASME-certified tank, and 175 PSI rating make it a self-contained jobsite solution. Go with the SANBORN INDUSTRIAL AIR 2 STAGE 5HP AIR COMPRESSOR PUMP if you already have a tank and just need a two-stage replacement pump. At $790, it costs $1,909 less than the AllMetal, but it is not a complete compressor package.
Comparison Table
| Feature | AllMetal 40 Gal Gas Air Compressor | Sanborn 2-Stage Pump |
|---|---|---|
| Price | USD 2,699.00 | USD 790.00 |
| Package | Complete compressor with 40 gal tank | Two-stage reciprocating pump unit |
| Output | 14.5-20.6 CFM, 175 PSI max | 17 CFM |
| Power | 9HP OHV gas engine | 5HP-rated pump |
| Best for | Off-grid jobsites, one-box buys | Shop builds, pump replacement |
Where Each Product Wins
- The AllMetal wins for portability and self-containment: a complete gas-powered frame with its own tank.
- The Sanborn wins for flexibility: a pump unit that leaves your tank choices open.
Product Notes
AllMetal 40 Gal Gas Air Compressor
The AllMetal pairs a 4-stroke OHV gas engine with an ASME-certified powder-coated steel tank, so it can run air tools in places without grid power. Its flow rate of 14.5-20.6 CFM and 80% duty-cycle rating mean it is built for sustained work with impact wrenches, spray guns, sandblasters, and nailers. The integrated package saves you from sourcing a tank, engine, and controls separately, and the 250-pound weight tells you this is a serious piece of equipment. The trade-off is that weight: moving it takes planning, and it is better suited to a trailer or fixed worksite than to frequent hauling. For a jobsite that needs air immediately, though, this is the one-box answer.
SANBORN 2-Stage Air Compressor Pump
Sanborn's two-stage reciprocating pump is a component, not a complete compressor. It is rated at 5HP and moves 17 CFM, and the model family (SC23 / C521E80 / C580) gives you concrete identifiers to use when matching against an existing system. That makes it a natural choice when you're replacing a tired pump or assembling a shop air setup around your own tank and drive. The main attraction is that you pay only for the pump, so you avoid buying a tank and frame you may not need. The flip side is that no storage tank, no gas engine, and no portable cart are included. You'll need to supply those parts, which suits someone with an existing air system more than a first-time buyer expecting a plug-and-play compressor.
Final Choice by Use Case
- Off-grid jobsite, ready to run: AllMetal 40 Gal Gas Air Compressor.
- Shop system or pump replacement: SANBORN 2-Stage Air Compressor Pump.
- Need one box and minimal assembly: AllMetal.
- Reusing existing tank infrastructure: Sanborn.
