--- product_id: 47947424 title: "400P-Automatic Function Portable Compressor" brand: "viair" price: "3989 zł" currency: PLN in_stock: true reviews_count: 5 category: "Viair" url: https://www.desertcart.pl/products/47947424-400p-automatic-function-portable-compressor store_origin: PL region: Poland --- # 12V direct battery power 3 CFM air flow capacity Quiet 74 dB operation 400P-Automatic Function Portable Compressor **Brand:** viair **Price:** 3989 zł **Availability:** ✅ In Stock ## Summary > 🚙 Inflate like a pro, wherever the road takes you! ## Quick Answers - **What is this?** 400P-Automatic Function Portable Compressor by viair - **How much does it cost?** 3989 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/47947424-400p-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 - • **Smart Auto Shut-Off:** Stops automatically at preset PSI to save power and prevent overinflation. - • **Powerful 150 PSI Max:** Handles tires up to 35 inches—perfect for off-road and agricultural vehicles. - • **Compact & Quiet Design:** Lightweight, vibration-dampened unit runs quietly at 74 dB—ready for any adventure. - • **Plug & Play Portability:** Direct battery connection with alligator clamps and 40A inline fuse for hassle-free use. - • **Precision Pressure Gauge:** Built-in, highly accurate gauge eliminates guesswork and extra tools. ## Overview The VIAIR 400P Automatic Portable Compressor is a 12V, 150 PSI max pressure inflator designed for off-road and agricultural tires up to 35 inches. Featuring a 3 CFM airflow, built-in automatic shut-off, and a precise pressure gauge, it connects directly to your vehicle battery with alligator clamps and includes a 40 amp inline fuse. Its compact, lightweight design operates quietly at 74 decibels, making it an essential, reliable tool for on-the-go tire inflation. ## Description This item is designed to fit specific vehicles. Please ensure correct part fitment before purchasing this project. Contact the seller directly for additional product information and availability. Review: Viair is top of the line as far as I’m concerned. It is well built and constructed with quality components. This is my second unit. I also have one for my RV. I tried this unit out today and I am dutifully impressed. The gauge is spot on accurate so no need to double check the pressure with a small handheld gauge. It seems to be quieter than my older unit and it is also smaller and lighter. This 400P Automatic is the way to go because it has a built-in PSI regulator that turns the unit off when it is not being used. Meaning it doesn’t run continuously when turned on. Big big upgrade from the regular 400P and I highly recommend this version. I think it is definitely worth the extra cost. This compressor is going to be kept in my Jeep for off-road adventures. Super happy with this upgrade. Review: I wish all compressor had auto on/off. To use it, simply turn it on. It will pressurize the hose and will then turn off. Then you can pump the tires. As you pump (press the lever on the air chuck) the compressor detects a pressure drop, and turns on. Very cool. So you just leave it on, and once you are done with all tires you then turn it off. The hose is nice quality. Light. The connectors on hose are brass. The air chuck and gauge are heavy duty. You can use a third party one if you like. Standard 1/4 NPT connectors are used throughout. The unit is very quiet when running, and does not vibrate like crazy. Comes with a nice rubber pad under the metal plate. Comes with a handy bag. Overall very happy. Wish it was made elsewhere though, I would be willing to pay extra for that. ## Features - 12 VOLT 150 PSI Max Working Pressure engine must be running during use - 2 - 3CFM Free Flow 0 PSI - Powered direct to the car battery with alligator clamps comes with a 40 amp inline fuse - Great for inflating tires up to 35inches on offroad and agricultural vehicles ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000X9B32M | | Air Flow Capacity | 3 Cubic Feet Per Minute | | Brand | VIAIR | | Capacity | 2.3 Cubic Feet | | Customer Reviews | 4.8 4.8 out of 5 stars (1,242) | | Global Trade Identification Number | 00818114004056 | | Hose Length | 30 Feet | | Included Components | No included components | | Item Weight | 4.85 kg | | Manufacturer | VIAIR | | Model Name | 40045 | | Model Number | 40045 | | Motor Horsepower | 3 Horsepower | | Power source | Battery Powered | | Recommended Uses For Product | Tire Inflation | | Sound Level | 74 Decibels | | Special Features | Automatic Shut-Off, Portable | | Style | Portable | | UPC | 818114004056 | | Voltage | 12 Volts | ## Product Details - **Brand:** VIAIR - **Noise level:** 74 Decibels - **Power source:** Battery Powered - **Recommended uses for product:** Tire Inflation - **Voltage:** 12 Volts ## Images ![400P-Automatic Function Portable Compressor - Image 1](https://m.media-amazon.com/images/I/51lEUKCXqhL.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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by R***V on 18 September 2025* Viair is top of the line as far as I’m concerned. It is well built and constructed with quality components. This is my second unit. I also have one for my RV. I tried this unit out today and I am dutifully impressed. The gauge is spot on accurate so no need to double check the pressure with a small handheld gauge. It seems to be quieter than my older unit and it is also smaller and lighter. This 400P Automatic is the way to go because it has a built-in PSI regulator that turns the unit off when it is not being used. Meaning it doesn’t run continuously when turned on. Big big upgrade from the regular 400P and I highly recommend this version. I think it is definitely worth the extra cost. This compressor is going to be kept in my Jeep for off-road adventures. Super happy with this upgrade. ### ⭐⭐⭐⭐⭐ Review *by I***R on 23 March 2022* I wish all compressor had auto on/off. To use it, simply turn it on. It will pressurize the hose and will then turn off. Then you can pump the tires. As you pump (press the lever on the air chuck) the compressor detects a pressure drop, and turns on. Very cool. So you just leave it on, and once you are done with all tires you then turn it off. The hose is nice quality. Light. The connectors on hose are brass. The air chuck and gauge are heavy duty. You can use a third party one if you like. Standard 1/4 NPT connectors are used throughout. The unit is very quiet when running, and does not vibrate like crazy. Comes with a nice rubber pad under the metal plate. Comes with a handy bag. Overall very happy. Wish it was made elsewhere though, I would be willing to pay extra for that. ### ⭐⭐⭐⭐⭐ Review *by I***R on 2 October 2010* Yes, this thing was made in China but what are we going to do, they all are. I have used this unit several times since I got it and it rides in my SUV everywhere. You can fill up truck tires and smaller items like bicycle tubes just fine. This model has auto shut off so you can use it by only squeezing the triggle, you don't have to keep turning the unit on and off. I like this because I can have the trigger part far away from the pump where the on off swicth is. The unit must be connect to a car battery to work. FYI> I contacted the company here in the USA and they said you "can't" make it run from a transformer if you want to rig it to work from a home recepticle. They also answered a number of other questions, were quick to reply to my email and seemed customer service oriented. I would recommend buying from this manufacturer. The unit seems of very good and solid quality. The hose disconnects from the trigger and from the pump so if you want to change the components out, you could. The triggle with the guage on it is quite nice and heavy and better than I thought it would be. The only complaints I have with it is, I wish I didn't have to have it attached to the car for operation. It would be great if I could plug it in to a wall receptical because it is so handy, quick and easy to use. I also have never been a fan of the type of valve that is used in this unit to attach it to a valve stem. There are only so many ways to do it but trying to hold the valve tightly enough on a stem while using a great deal of strength to flip the switch closed is something that has left me wanting since I was a kid trying to pump up my BMX tire. It works great, I just like the service station type valve better. Maybe it could be changed out later I guess. Overall good product, highly recommended. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pl/products/47947424-400p-automatic-function-portable-compressor](https://www.desertcart.pl/products/47947424-400p-automatic-function-portable-compressor) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-17*