VIAIR 400P/40045 Automatic Portable Compressor, Tire Inflator Kit, Air Compressor for Truck, Jeep, SUV, and Car Tires, Portable Air Pump Kit, Car Accessories, 33% Duty Cycle, 150 PSI/2.30 CFM

VIAIR 400P/40045 Automatic Portable Compressor, Tire Inflator Kit, Air Compressor for Truck, Jeep, SUV, and Car Tires, Portable Air Pump Kit, Car Accessories, 33% Duty Cycle, 150 PSI/2.30 CFM

Q: 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.

Q: 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.

Q: 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

Q: 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.

Product ID: 6714415

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Details

Brand
VIAIR
Voltage
12 Volts
Recommended Uses For Product
Tire Inflation
Power Source
Battery
Noise Level
74 Decibels

⚡12V direct battery power

⏱️Fills 35" tire in under 3 mins

🛡️IP54 dust & water resistant

Frequently Bought Together

VIAIR 400P/40045 Automatic Portable Compressor, Tire Inflator Kit, Air Compressor for Truck, Jeep, SUV, and Car Tires, Portable Air Pump Kit, Car Accessories, 33% Duty Cycle, 150 PSI/2.30 CFM

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Description

🚙 Inflate Like a Pro, Anywhere, Anytime!

BUILT FOR THE RUGGED ROAD - Durable aluminum sand tray with vibration isolators and IP54 rating means this compressor thrives in dust, dirt, and water spray.
ALL INCLUSIVE READY TO GO KIT - Comes with a deluxe carry bag, 25-ft hose, inflation gun with 200 PSI gauge, multiple valve adapters, and heavy-duty battery clamps for instant deployment.
TRUSTED LEGACY OF RELIABILITY - Backed by 25+ years of VIAIR innovation, this compressor delivers consistent, maintenance-free performance for every adventure.
EFFORTLESS AUTOMATIC INFLATION - Set it and forget it with smart auto shut-off that stops at your desired PSI—no babysitting required.
POWERHOUSE PERFORMANCE IN A COMPACT PACKAGE - 150 PSI max pressure and 2.3 CFM airflow tackle tires up to 35" with rapid fill times, perfect for trucks, SUVs, and off-road rigs.

The VIAIR 400P Automatic Portable Compressor is a rugged, 12V direct battery-powered air pump designed for rapid inflation of tires up to 35 inches. Featuring a powerful permanent magnetic motor, it delivers up to 150 PSI with a 33% duty cycle and 2.3 CFM airflow. Its automatic shut-off, durable construction with IP54 rating, and comprehensive accessory kit make it the ultimate portable compressor for off-road enthusiasts and daily drivers alike.

Specifications

Brand	VIAIR
Voltage	12 Volts
Recommended Uses For Product	Tire Inflation
Power Source	Battery Powered
Noise Level	74 Decibels
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

Have a Question? See What Others Asked

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?

What does the “automatic” refer to?

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

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.

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