The DEWALT D55166 6-Gallon Horizontal Portable Electric Air Compressor is a compact but capable compressor for trim carpenters, roofers, and DIYers who need reliable air power on the go. It features a 6.0-gallon oil-lubricated pump that produces 135 max PSI and 3.8 SCFM at 90 PSI, enough to drive most framing and finish nailers, inflate tires, and run small air tools. The horizontal design with flat-free tires and a pull handle moves easily through doorways and around job sites.
DEWALT D55166 Portable Air Compressor: Power and Portability
The D55166 is built around an oil-lubricated pump for consistent output and longer pump life. The pressure gauges are angled upward so you can read and adjust them without squatting down, and the ball drain valve lets you purge condensation quickly—essential for keeping moisture out of your air lines. With a 135 PSI max rating, it also covers tools that need higher pressure, like framing nailers and air staplers.
Troubleshooting the D55166: What to Check First
If your D55166 seems to be losing pressure or won't build to full PSI, run through these checks:
- Drain valve: Make sure the ball drain valve is fully closed before start-up.
- Oil level: Check that the pump oil is at the proper level; low oil can trigger pressure problems or prevent restart.
- Air filter: A clogged intake filter reduces airflow and pressure output.
- Power connection: Confirm the unit is plugged into a working outlet and the on/off switch is in the on position.
Although the D55166 has a reliable pressure switch, troubleshooting steps like this help you rule out simple issues before calling for service.
Who Should Use the D55166?
This 6-gallon compressor is ideal for tradespeople who move from room to room, from house to house. It's small enough to fit in a truck bed, and the flat-free tires mean no flat tire breakdowns on the job. If you primarily run one or two nail guns at a time, this compressor gives you the output you need without the weight of a larger stationary unit.
