--- product_id: 40029363 title: "LE LEMATEC Air Compressor Water Separator, 1/4\" NPT Inline Filter | Moisture trap, paint gun & plasma cutter ready, auto-draining pneumatic dryer, model AI303" brand: "le lematec" price: "€ 41.53" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.at/products/40029363-le-lematec-air-compressor-water-separator-1-4-npt-inline store_origin: AT region: Austria --- # 99% moisture removal efficiency Heavy-duty aluminum & brass build 1/4" NPT universal inline fit LE LEMATEC Air Compressor Water Separator, 1/4" NPT Inline Filter | Moisture trap, paint gun & plasma cutter ready, auto-draining pneumatic dryer, model AI303 **Brand:** le lematec **Price:** € 41.53 **Availability:** βœ… In Stock ## Summary > πŸ’¨ Keep your airflow flawless β€” because your tools deserve the best! ## Quick Answers - **What is this?** LE LEMATEC Air Compressor Water Separator, 1/4" NPT Inline Filter | Moisture trap, paint gun & plasma cutter ready, auto-draining pneumatic dryer, model AI303 by le lematec - **How much does it cost?** € 41.53 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/40029363-le-lematec-air-compressor-water-separator-1-4-npt-inline) ## Best For - le lematec enthusiasts ## Why This Product - Trusted le lematec brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Quick Push-Button Drain:** Fast, no-fuss maintenance keeps your air supply dry and tools performing at peak power. - β€’ **Ultimate Moisture Defense:** Eliminate condensation, oil & dirt before they damage your tools or ruin finishes. - β€’ **Rugged Aluminum Durability:** Built to withstand high-impact workshop environments without cracking or corrosion. - β€’ **Universal 1/4" NPT Compatibility:** Fits instantly with most air hoses, couplers & pneumatic tools for seamless integration. - β€’ **Pro-Grade Paint & Airbrush Quality:** Guarantee flawless, spot-free automotive and hobbyist finishes every time. ## Overview The LE LEMATEC AI303 Air Compressor Water Separator is a compact, high-efficiency inline filter designed to remove moisture, oil, and dirt from compressed air lines. Featuring a rugged aluminum housing and brass fittings, it fits standard 1/4" NPT connections and operates at 5-150 PSI. Its centrifugal gravity separation technology ensures zero pressure drop while protecting pneumatic tools and paint finishes. With a convenient push-button drain valve, it offers quick maintenance and reliable, professional-grade air quality for automotive, hobbyist, and industrial applications. ## Description Follow our 3-step process: wrap threads with Teflon tape, connect with arrow pointing toward tool, test by pressing the drain valve. Takes under 2 minutes for reliable, leak-free operation. β€” Moisture causes fish eyes and adhesion failure. The AI303 removes water before your gun for pro-quality finishes. β€” Water and oil corrode internal parts, causing early wear. The AI303 is your tools' first line of defense against moisture. β€” Moisture ruins airbrush gradients and detail work. AI303's gravity separation removes water before precision tools. β€” Install the AI303 as Stage 1 of your air quality chain. Add a ZN312 filter as Stage 2 for near-surgical air quality. The AI303's compact form factor is by design β€” it fits anywhere in your air line without adding bulk. Precision-machined aluminum means no wasted space. Install between your compressor and tools in under 2 minutes. Works with all 1/4" NPT equipment (5-150 PSI). AI303 Inline Filter Digital Air Regulator Premium Sandblaster Air Compressor Fittings Sandblaster Connector Kit What's the difference between the AI303 and the ZN312? AI303 is a gravity separator removing bulk liquid and oil via centrifugal force. The ZN312 is a 1-micron filter capturing fine mist/moisture. For best air quality, install AI303 first (Stage 1) and ZN312 second (Stage 2). Will this cause pressure drop in my air line? No. The AI303 features an optimized flow path engineered to maintain full downstream pressure. Unlike cheap restrictive filters, it uses centrifugal separation that works WITH the air flow. Your tools will perform at their maximum pressure. How often do I need to drain the bowl? Drain frequency depends on humidity. Check the transparent bowl and push the drain valve when water reaches the 1/3 mark (takes 2 seconds). In hot, humid conditions, drain every 30-60 minutes. Standard 1/4" NPT connections install in minutes. Why aluminum instead of plastic? Aluminum offers 3 advantages: (1) Thread integrity to prevent stripping, cross-threading, and air leaks. (2) Corrosion resistance against separated moisture. (3) Structural strength to handle pressure surges without cracking. Built to last. Is the AI303 compatible with my tools? Yes. With standard 1/4" NPT connections (female inlet, male outlet), the AI303 is compatible with virtually all home and professional compressors and tools, including HVLP guns, airbrushes, and impact wrenches. Operating range: 5-150 PSI. LE LEMATEC: Leading and trusted in air compressor tools. Experience unmatched quality and innovation. Experience smooth, efficient sandblasting with LE LEMATEC's advanced tools. Perfect for precise, clean results every time. Le Lematec Sandblasters in Action on Restoration Wonders Le Lematec Sandblasters at Work on Flawless Surface Cleaning Breathing New Life into Classic Treasures The LE LEMATEC logo symbolizes excellence in air compressor tools, embodying innovation and precision. Representing top-tier pneumatic solutions, it's ideal for professionals and DIY enthusiasts. This emblem signifies reliability, enhancing productivity in various tasks with advanced functionality. ## Features - Ultimate Moisture Defense: Acts as a high-efficiency air water separator for air compressor lines, removing condensation, oil, and dirt before they reach your equipment. This compressor water separator prevents water spots in paint jobs and rust in expensive pneumatic tools. - Flawless Paint & Airbrush Finishes: Essential paint gun filter that attaches directly to spray guns and airbrushes. By trapping moisture at the source, this air water separator ensures a clean, dry airflow for professional-grade automotive and hobbyist finishing without defects. - Universal Inline Fit: Designed with standard 1/4-inch NPT inlet and outlet, this air line water separator fits most air hoses, couplers, and fittings. It installs instantly as a water separator for air compressor setups, sandblasters, and plasma cutters. - Rugged & Reliable Construction: Unlike plastic alternatives, this unit features a heavy-duty aluminum housing and brass fittings. It serves as a durable air water separator for air compressor systems in high-impact garage and industrial workshop environments. - Push-Button Drain Valve: Features a convenient push-button drain for fast maintenance. Quickly release trapped contaminants from the water separator without disassembling the line, ensuring your air supply remains dry and your tools operate at peak performance. ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B01N4FMOMU | | Best Sellers Rank | #54,597 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #135 in Air-Compressor Accessories | | Brand Name | LE LEMATEC | | Compatible Devices | air compressor air filter, air water separator for air compressor, compressor air dyer, compressor air filter, inline air dryer | | Customer Reviews | 4.4 4.4 out of 5 stars (1,730) 4.4 out of 5 stars | | Filter Mounting Type | Screw In | | Global Trade Identification Number | 00850030726711 | | Item Dimensions L X W X Thickness | 1.57"L x 1.57"W x 3.62"Th | | Item Highlight | Moisture trap, paint gun & plasma cutter ready, auto-draining pneumatic dryer, model AI303 | | Item Weight | 5.6 ounces | | Manufacturer | LE LEMATEC | | Manufacturer Part Number | AI-303 | | Material Type | Aluminum, Stainless Steel | | Model Number | AI303 | | Number Of Items | 1 | | Number Of Packs | 1 | | Product Grade | Like New | | Unit Count | 1 Count | ## Product Details - **Brand:** LE LEMATEC - **Filter Mounting Type:** Screw In - **Global Trade Identification Number:** 00850030726711 - **Item Weight:** 5.6 ounces - **Manufacturer:** LE LEMATEC - **Material:** Aluminum, Stainless Steel - **Number of Items:** 1 - **Number of Packs:** 1 - **Product Dimensions:** 1.57"L x 1.57"W x 3.62"Th ## Images ![LE LEMATEC Air Compressor Water Separator, 1/4" NPT Inline Filter | Moisture trap, paint gun & plasma cutter ready, auto-draining pneumatic dryer, model AI303 - Image 1](https://m.media-amazon.com/images/I/71nJ7HzhsHL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: What's the difference between the AI303 and the ZN312?** A: AI303 is a gravity separator removing bulk liquid and oil via centrifugal force. The ZN312 is a 1-micron filter capturing fine mist/moisture. For best air quality, install AI303 first (Stage 1) and ZN312 second (Stage 2). **Q: Will this cause pressure drop in my air line?** A: No. The AI303 features an optimized flow path engineered to maintain full downstream pressure. Unlike cheap restrictive filters, it uses centrifugal separation that works WITH the air flow. Your tools will perform at their maximum pressure. **Q: How often do I need to drain the bowl?** A: Drain frequency depends on humidity. Check the transparent bowl and push the drain valve when water reaches the 1/3 mark (takes 2 seconds). In hot, humid conditions, drain every 30-60 minutes. Standard 1/4" NPT connections install in minutes. **Q: Why aluminum instead of plastic?** A: Aluminum offers 3 advantages: (1) Thread integrity to prevent stripping, cross-threading, and air leaks. (2) Corrosion resistance against separated moisture. (3) Structural strength to handle pressure surges without cracking. Built to last. **Q: Is the AI303 compatible with my tools?** A: Yes. With standard 1/4" NPT connections (female inlet, male outlet), the AI303 is compatible with virtually all home and professional compressors and tools, including HVLP guns, airbrushes, and impact wrenches. Operating range: 5-150 PSI. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Convenient and good value *by on Reviewed in the United States March 24, 2026* This is a great little filter/dryer! I purchased this air dryer for use with an old 3-gallon horizontal air compressor that a friend gifted to me, and which I use for low-flow applications. Rather than installing the dryer right at the tool, where if would increase the overall size of the tool and could be snagged, or be subject to the weight of the hose, I installed it at the compressor outlet quick coupler, where it is out of the way and not subject to excessive pulling. When I'm done with the task I simply rotate the dryer around so that the drain button is at the low end and press the button to expel the condensate. Quick, easy, totally effective, and great value. ### ⭐⭐⭐⭐⭐ Update .... One of two units are unusable. *by on Reviewed in the United States July 13, 2021* Leak at point between air release button and body of unit. Both ordered at different times.First one appears to be great, installed with ease, no leaks and does a good job eliminating moisture.Second unit leaks to the point that it is unusable.Unfortunately the bad unit sat on my desk for too long, and wasn't returnable. I hope the company makes it right.Only 50% worked. Not satisfactory at all.UPDATE - I was contacted by the seller who will replace the defective unit. Changed from 2 stars to 4 stars due to sellers response. After install will update review if necessary.Exemplary Customer Service. The company was quick to make things right. Cannot say enough for them. Used on two compressors. Both units in a 1800 sq ft shop, 1 upstairs and 1 downstairs. Both work just fine. If your looking to keep your airtools and plasma cutter running smooth, keep your air clean. These do the job Thank You ### ⭐⭐⭐⭐ Can’t get more then 30psi *by on Reviewed in the United States July 28, 2026* Works but for some reason I can’t get more then 30psi from it does anybody know why?I have a 100psi coming from air line ## Frequently Bought Together - LE LEMATEC Air Compressor Water Separator, 1/4 NPT Inline Filter & Moisture Trap for Pneumatic Tools, HVLP Spray Paint Gun & Airbrush, Durable Compressed Air Dryer with Easy Drain Valve, AI303 - LE LEMATEC Portable Sandblaster Gun Kit, Air Compressor Sand Blaster, Paint & Rust Remover, Abrasive Media & Soda Blaster for Metal, Wood, Automotive & DIY Surface Prep, AS118-2C - LE LEMATEC Air Dryer for Compressor, Inline Moisture Filter for HVLP Spray Paint Gun, Plasma Cutter & Other Pneumatic Tools, Easy Drain Oil & Water Separator (ZN312) --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.at/products/40029363-le-lematec-air-compressor-water-separator-1-4-npt-inline](https://www.desertcart.at/products/40029363-le-lematec-air-compressor-water-separator-1-4-npt-inline) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-09-08*