---
product_id: 729436359
title: "VIAIR - 40045 400P-Automatic Function Portable Compressor"
brand: "viair"
price: "$1678.61"
currency: USD
in_stock: true
url: https://www.desertcart.ec/products/729436359-viair-40045-400p-automatic-function-portable-compressor
store_origin: EC
region: Ecuador
---

# 12V direct battery power Inflates up to 35" tires fast 150 PSI max pressure with auto shutoff VIAIR - 40045 400P-Automatic Function Portable Compressor

**Brand:** viair
**Price:** $1678.61
**Availability:** ✅ In Stock

## Summary

> 🛠️ Inflate Like a Pro, Anywhere, Anytime!

## Quick Answers

- **What is this?** VIAIR - 40045 400P-Automatic Function Portable Compressor by viair
- **How much does it cost?** $1678.61 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/729436359-viair-40045-400p-automatic-function-portable-compressor)

## Best For

- viair enthusiasts

## Why This Product

- Trusted viair brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rapid Inflation:** Fill large 35" tires from 15 to 30 PSI in under 2.5 minutes—get back on the road or trail faster.
- • **Smart Auto Shutoff:** Automatically stops at preset pressure up to 150 PSI, saving time and preventing over-inflation.
- • **Built for the Rugged:** Durable aluminum sand tray with vibration isolators ensures stable operation on tough terrain.
- • **Power Meets Portability:** Compact 8.5 lbs design fits easily in your trunk or top box for on-the-go inflation.
- • **Complete Ready-to-Go Kit:** Includes deluxe carry bag, 25' hose, inflation gun with gauge, multiple adapters, and heavy-duty battery clamps.

## Overview

The VIAIR 400P Automatic Portable Compressor is a rugged, 12V direct battery-powered air compressor designed for off-road and everyday use. It delivers up to 150 PSI with an automatic shutoff feature, inflates large tires up to 35 inches quickly, and comes with a full accessory kit in a compact, durable carry case. Trusted by enthusiasts for over 25 years, it combines high performance, portability, and smart features to keep you moving without compromise.

## Description

Product Description               VIAIR 400P AUTOMATIC 12V Portable Air Compressor for Truck Tires The 400P tire pump for trucks, SUVs, RVs and more is portable, lightweight, and features an automatic shut-off setting. Measures 10.9" max and weighs 10 lbs. It can be easily stored in the trunk or top box and easily retrieved without air. Electric Truck Tire Pump with Carry Case Conveniently stored in a durable canvas carrying case with a top handle, the 400P tire inflator air compressor is ready to use wherever you are at home, parked on a busy road. Universal fit From trucks and SUVs to motorcycles and side-by-sides, this small air compressor is portable and powerful. Fill 35" tires from 15 to 30 PSI in less than 2 minutes and 45 seconds, the 400P returns to the road in minutes no matter what you're driving. Quick and easy to use - no programming required Attach the alligator clip to the vehicle's battery terminal, start the engine and turn the compressor on, the hose will be pressurized to 150 PSI and turned off. Connect the air hose to the vehicle's tire, pull the trigger on the inflation gun to start inflation. From road to trail VIAIR battery-powered air compressor pump is loved by everyday commuters, families and extreme off-road enthusiasts with powerful and reliable performance in a small package. 12V battery clamp for high performance Off-road applications have high performance demands that cigarette lighter plugs can't meet Hobbyists prefer to connect batteries directly to trucks, jeeps, and 4x4. This is due to the increased current consumption of larger and stronger compressors. VIAIR offers a cigarette lighter model but we recommend a compressor with battery clamp for off-road use                  .com Review                The 400P Automatic is VIAIR's first Automatic shutoff function portable compressor. Powered by an easy-to-establish temporary connection to a 12-volt battery power source, this 33% duty cycle unit is capable of pressures up to 150 PSI and can be operated for up to 40 minutes at a time before needing to be rested. The 400P Automatic comes with a range of accessories stowable in its soft carry case, including a convenient close-ended gas station-style air gun. .caption { font-family: Verdana, Helvetica neue, Arial, serif; font-size: 10px; font-weight: bold; font-style: italic; } ul.indent { list-style: inside disc; text-indent: -15px; } table.callout { font-family: verdana; font-size: 11px; line-height: 1. 3em; } td.vgoverview { height: 125px; background: #9DC4D8 url(http://images..com/images/G/01/electronics/detail-page/callout-bg.png) repeat-x; border-left: 1px solid #999999; border-right: 1px solid #999999; padding-left: 20px; padding-right: 20px; padding-bottom: 10px; width: 250px; font-family: verdana; font-size: 12px; } Portable Automatic Compression up to 150 PSI The VIAIR 400P-Automatic Portable Compressor offers inflation of up to 35-inch tires, and operation at up to 150 PSI for up to 15 continuous minutes at a time, providing that there are 30 minutes provided afterwards for the unit to cool sufficiently. More than just a compressor, the 400P is a complete portable compression system, coming complete with an inflation gun with 200 PSI air pressure gauge, a 25' extension hose with quick connect coupler and lever chuck, a heavy duty sand tray with vibration isolators, a 8' power cable, a heavy duty sand tray with vibration isolators, a 3-piece inflation tips kit, an inline fuse holder, a deluxe zippered carry bag and dual heavy duty direct battery clamps. The convenient battery clamps allow you to quickly utilize any 12-volt power source, including your own vehicle's battery, to address your air compression needs in seconds.  Portable air compression up to 150 PSI suitable for tires up to 35". View larger.  All your compression needs are in the bag. View larger.  Heavy duty tray included for vibration control. View larger. The 400P also contains a convenient automatic time and power-saving features. The unit comes with an automatic shutoff function that will power down the 400P when the compressor is turned on, but not actively filling tires - making it unnecessary to turn the unit off between tire fills. In addition, the included closed-ended tire inflation gun allows for on-the-fly tire pressure reading, without having to turn the unit off to check tire pressure. 400P Air Compressor SpecificationsMotor voltage - 12 voltMotor type - Permanent magneticMax. duty cycle: 33% @ 100 PSIMax. working pressure - 150 PSIMax. Amp draw - 30 AmpsMax. ambient temperature - 158°FMin. ambient temperature - -40°FCFM @ 0 PSI - 2.54Built-in pressure switch - 120 PSI on, 145 PSI offFuse - 40 AmpsAuto. Reset thermal protection - YesDimensions - 11.25"L x 4.00"W x 7.00"HNet weight - 8.50 lbsAbout Compressor Duty Cycle Compressor duty cycle refers to amount of time a compressor can be operated in a given time period, at 100 PSI and at a standard ambient temperature of 72°F. Duty Cycle is commonly expressed in percentile as: compressor on time (compressor on time + off time) %. As an example, a compressor that is rated for 25% duty cycle means that compressor can be operated at: 100 PSI @ 72°F for 10 minutes on and 30 minutes off. 10 min. on / (10 min. on + 30 Min. off) = 10 min. / 40 Min = 25% duty cycle. Fill Rates: 31" x 10.5" 33" x 12.5"  35" x 12.5" 0 - 30 PSI 2 min. 28 sec. 4 min. 4 min. 50 sec. 15 - 30 PSI 1 min. 25 sec. 2 min 2 min. 20 sec.  What's in the Box 1-VIAIR 400P portable air compressor1-Deluxe zippered carry bag with storage compartments1-Gas station style inflation gun with 200 PSI air pressure gauge1-25' extension hose with quick connect coupler and lever chuck1-Heavy duty sand tray with vibration isolators1-Set of dual heavy duty direct battery clamps1-8' power cable1-3 piece inflation tips kit1-Inline fuse holder1-Owner's manual1-Year Limited Warranty VIAIR Corporation warrants this product, when properly installed and under normal conditions of use, to be free from defects in workmanship and materials for a period of one (1) year from its original date of purchase. This warranty covers product defects only. It does not cover incidental or consequential damages as a result of misuse or abuse. About VIAIR Corporation VIAIR offers the most complete line of air compressors and air accessories for both the on-and off-road markets available anywhere. VIAIR products are used in the OEM segment, 4x4 and Sport Air Suspension and have become the industry standard for both 12- and 24-volt automotive applications worldwide. Their compressors are currently being used in every corner of the globe, in the harshest climates imaginable and the company is recognized by its customers and peers alike as the leading manufacturer of high performance air compressors for mobile pneumatic applications.

## Features

- High Performance *Auto* Off-Road Compressor (Model: 40045, 12V, 150 PSI, 35" Tire) - 400P Portable Truck Air Compressor is a 12V heavy duty electric air compressor for off-road enthusiasts. The powerful direct drive gearless motor and maintenance free operation are ideal for tackle tough terrain. Ultra compact and can be stored in a carrying case
- Explore without limitations: Truck, SUV, Jeep, Off-Road, 4x4s, Side-by-Side, RV, Motorcycle, Road Bike, Mountain Bike *Usage: Attach the battery clamp to the car battery and start the engine. Connect to the valve stem and turn on the main unit. Please use the provided Presta bicycle valve adapter if needed
- Included Components: 12V mini air compressor tire inflators come with a 25' 5 inflator/deflator air hose with inline 100 PSI gauge, 8' power cord, deluxe dual compartment carrying bag, 3 inflation tips (3/16" nozzle, 5/16" nozzle, needle adapter). ter), Presta Valve Adapter Features: Aluminum I-Beam Sand Tray, Thermal Overload Protector, 40 Amp Inline Fuse Holder, Press-On Tire Chuck
- LARGE CAPACITY FOR LARGE TIRES: Powered by 12 volts, this small, powerful electric air compressor has a permanent magnet motor for maximum working pressure of 150 PSI, 33% duty cycle @ 100 PSI, free flow capacity: 2.3 CFM. Maximum Recommended Tire Size: 35 inches (88.9 cm) Fill 35 inch tires from 15-30 PSI in 2 minutes. IP54 rated for under 45 seconds to protect against dust and splashes from all directions. Dimensions: 10.87"L x 5.83"W x 7.48"H; 10,000 lbs
- QUALITY YOU CAN TRUST: The VIAIR off-road compressor gives you the freedom to explore more and challenge your boundaries For over 25 years, an American owned and operated company has been providing the highest quality portable air compressors and inflators. Durable, ongoing testing and a commitment to improvement ensures long-lasting performance

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Viair Corporation |
| Brand | VIAIR |
| Model | 400P Automatic Portable Compressor Kit |
| Product Dimensions | 27.61 x 14.81 x 19 cm; 4.85 kg |
| Item model number | 40045 |
| Is Discontinued By Manufacturer | No |
| Exterior | Painted |
| OEM Part Number | 40045 |
| Special Features | Portable |
| Item Dimensions  L x W x H | 27.6 x 14.8 x 19 cm |
| Voltage | 12 Volts |
| Color | Silver |
| Capacity | 2.3 Cubic Feet |
| Item Weight | 4.85 Kilograms |

## Product Details

- **Brand:** VIAIR
- **Voltage:** 12 Volts
- **Recommended Uses For Product:** Tire Inflation
- **Power Source:** Battery Powered
- **Noise Level:** 74 Decibels
- **Special Feature:** Portable
- **Included Components:** air_hose
- **Item Weight:** 4.85 kg
- **Maximum Power:** 360 Watts
- **Capacity:** 2.3 Cubic Feet

## Images

![VIAIR - 40045 400P-Automatic Function Portable Compressor - Image 1](https://m.media-amazon.com/images/I/51lEUKCXqhL.jpg)
![VIAIR - 40045 400P-Automatic Function Portable Compressor - Image 2](https://m.media-amazon.com/images/I/911KkPsvHuL.jpg)
![VIAIR - 40045 400P-Automatic Function Portable Compressor - Image 3](https://m.media-amazon.com/images/I/81AkuZaHcvL.jpg)
![VIAIR - 40045 400P-Automatic Function Portable Compressor - Image 4](https://m.media-amazon.com/images/I/81PWx+uUprL.jpg)
![VIAIR - 40045 400P-Automatic Function Portable Compressor - Image 5](https://m.media-amazon.com/images/I/81LarDYmDIL.jpg)

## Questions & Answers

**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?**
A: 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?**
A: 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**
A: 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.**
A: 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.

## 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
- ARB ARB505 Deflator Kit 10-60 PSI Tire Pressure Gauge Rapid Air Down Offroad Kit With Recovery Gear Pouch (PSI)
- ARB 10000011 Speedy Seal 2 - Universal Heavy Duty Tire Repair Kit For Car, Truck, RV, Jeep, ATV, Motorcycle, Tractor, Trailer. Flat Tire Puncture Repair Kit Fix Punctures and Plug Flats 50 String Plug

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-01-24*