VIAIR 400P-A EF 12V Off-Road Tire Inflator - 150 PSI, Enhanced Flow, Automatic Shut-Off, Compact Kit

The VIAIR 400P-A EF is a compact 12V automatic air compressor built to quickly and reliably inflate off-road tires up to 35 inches, delivering up to 150 PSI with enhanced airflow and automatic shut-off.

Designed for trucks, SUVs, Jeeps and other off-road vehicles, the 400P-A EF combines a higher-flow compressor head, a direct-drive motor and a lightweight I-beam tray to give faster fills, improved cooling and stable operation on rough ground. It ships as a complete kit in a dual-compartment carry bag and runs from a 12V battery via heavy-duty clamps or a 2-pin SAE plug for flexible power connections.

How quickly will the 400P-A EF inflate my tires?

This unit is engineered for speed and consistent pressure control. In real-world tests it fills a 35" tire from 15 to 30 PSI in under three minutes, and its automatic shut-off prevents overinflation once the preset pressure is reached.

• Fills 35" tire 15→30 PSI in about 2:45 minutes
• Direct-drive motor with 2.59 CFM free-flow capacity for faster air delivery
• Automatic pressure control stops inflation at your set PSI
• Gas-station style inflation gun for precise trigger control

What makes this compressor better suited for off-road use?

VIAIR optimized the head and mounting system for trail conditions, focusing on heat dissipation, reduced noise and vibration resistance. The included I-beam sand tray stabilizes the unit on uneven or soft surfaces, while the durable carry bag keeps accessories organized when you’re away from pavement.

• Enhanced Flow (EF) head for improved cooling and quieter operation
• Patented lightweight I-beam sand tray to minimize vibration and tipping
• 30-foot coiled air hose and 8-foot power cord for flexible placement
• Durable carrying bag with dual compartments for tools and fittings

How do I power and operate the 400P-A EF on the trail?

The 400P-A EF is straightforward to set up: connect the battery clamps to a 12V battery (recommended for maximum performance), attach the hose and inflation gun to the tire valve, then switch the compressor on. A pre-installed 2-pin SAE connector lets you hook into compatible power sources, including VIAIR’s 7-way trailer plug.

• Connect heavy-duty battery clamps for full-power operation
• Use 2-pin SAE connector for alternate 12V power options
• Attach gas-station style gun, set pressure, and let automatic shut-off finish
• Includes three inflation tips for different valve types and inflatables

What accessories are included and how is the unit packed?

The compressor ships as a trail-ready kit with accessories arranged for quick access. Everything fits in a compact, dual-compartment bag so you can stow the kit in a vehicle without losing parts during travel.

• 30-foot coiled air hose and gas-station style inflation gun
• 8-foot power cord, battery clamps, and pre-installed 2-pin SAE plug
• Three inflation tips for sports equipment and other inflatables
• Dual-compartment carry bag and aluminum I-beam sand tray included

Who is this for: The VIAIR 400P-A EF is aimed at off-road enthusiasts, overlanders and drivers of trucks or SUVs who need a reliable, fast 12V inflator for large tires and remote travel. It suits anyone who wants a compact, durable kit that provides higher performance than lighter cigarette-lighter compressors, especially when inflating large-diameter tires or operating on uneven ground.