Can this unit be used with a normal electric outlet or do I need to buy an ac/dc convertor when I want to use it in the garage without a battery?

This unit is strictly a 12 volt DC powered compressor. If you wish to use this on house current, you will need to use a 12 volt DC power supply which could handle the required amperage. I would suggest a small car or lawn mower battery of at least 100 ampere capacity. Put a trickle charger on it and you would good to go. Most of these battery powered compressors will draw considerable current during operation and they will get hot so be sure to take care when operating and keep the compressor clear of any combustible items.

What does the “automatic” refer to?

According to a customer Service rep at Viair, the 440P-auto does NOT let the user set a desired pressure and then automatically shut off when the tire reaches that pressure. All it does is shut off when it meets the compressors max rated pressure. Perhaps the service rep did not know what he was talking about, but if that's all it does, the feature is just about useless: If you pump a typical tire up to 150 PSI, you most likely have already damaged the tire.

What is automatic about it? does it shut off a a set psi? i want all my tires at 32

Hello, The automatic feature is not a "set it and forget it" type. You will still have to manually control the pressure for each tire. Our portable compressors with the automatic feature really helps when moving from tire to tire, and when checking tire pressure in the middle of a tire fill. Non automatic compressors must be turned off between tire fills, and anytime you want to check tire pressure. That means you'll be running back and forth to the compressor turning the unit on and off. The automatic feature will save you time & effort to get tires inflated quickly. Thanks, VIAIR Corp 949-585-0011

Must you continuously hold the lever on the inflation gun to inflate a tire? Seems like that would be very tiresome to do anything but add a few lbs.

It doesn’t take that long to fill em. I’d rather hold the chuck in one hand and and a beer in the other than get distracted and forget it. The original filler clip fell off the stem a lot and made it a 2 hand job so I got another one at Home Depot for 20 bucks. I carry regular chucks and lots of other spare parts like valve stems and covers. When I air down I pull the stems right out. When I’m filling I have a small fold up stool to sit on (or my cooler)and a digital gauge. I always have extra valve covers too. Most of the stuff Fits in a pill bottle. I carry an extra 25’ hose in case. Happy trails.

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Descripción

🛠️ Inflate Like a Pro, Anywhere, Anytime!

ALL TERRAIN READY - Inflates tires up to 35" in under 3 minutes—perfect for trucks, SUVs, Jeeps, and more.
COMPLETE INFLATION KIT - Includes 25 ft hose, inflation gun with 200 PSI gauge, 3 nozzle tips, Presta adapter, and rugged carry case.
HEAVY DUTY PERFORMANCE - Permanent magnetic motor delivers up to 150 PSI with a 33% duty cycle for serious off-road demands.
AUTOMATIC SHUT OFF TECH - Smart auto-stop prevents over-inflation and saves battery life—set it and forget it.
POWER MEETS PORTABILITY - Compact 10.87" x 5.83" x 7.48" design fits easily in your trunk or gear bag.

The VIAIR 400P Automatic Portable Compressor is a rugged 12V air pump designed for off-road and everyday vehicles. It delivers up to 150 PSI with a powerful permanent magnetic motor and features an automatic shut-off for ease and safety. Compact and lightweight at just 10.7 lbs, it inflates large tires (up to 35") quickly and comes with a full accessory kit including a 25-foot hose and durable carry case. Ideal for trucks, SUVs, Jeeps, and more, it ensures you're never stranded without air.

Presupuesto

Brand	VIAIR
Voltage	12 Volts
Recommended Uses For Product	Tire Inflation
Power Source	Battery Powered
Noise Level	74 dB
Special Feature	Automatic Shut-Off, Heavy Duty, Portable, Quick Inflation
Included Components	12v Portable Compressor, 160 PSI Tire Inflation Gun, 3 Pc inflation tips kit, 30ft inside braided coil hose, Presta Valve Adapter
Item Weight	10.7 Pounds
Maximum Power	360 Watts
Capacity	2.3 Cubic Feet
Color	Silver
Product Dimensions	10.87"L x 5.83"W x 7.48"H
AC Adapter Current	30 Amps
Air Flow Capacity	2.3 Cubic Feet Per Minute
Motor Horsepower	24.54 horsepower
Model Name	400P Automatic Portable Compressor Kit
Hose Length	30 Feet
Maximum Operating Pressure	150 Pound per Square Inch
Manufacturer	Viair Corporation
UPC	818114004056
Global Trade Identification Number	00818114004056
Item Weight	10.7 pounds
Item model number	40045
Is Discontinued By Manufacturer	No
Exterior	Painted
Manufacturer Part Number	40045
OEM Part Number	40045
Special Features	Automatic Shut-Off, Heavy Duty, Portable, Quick Inflation

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