--- product_id: 97870816 title: "Engine Air Valve Holder and Cylinder Leakage Testing Assistant Tool(Heavy Duty Hose 1000PSI) Fit with M12 or M14 Thread" brand: "kweiny" price: "148 zΕ‚" currency: PLN in_stock: true reviews_count: 13 category: "Kweiny" url: https://www.desertcart.pl/products/97870816-engine-air-valve-holder-and-cylinder-leakage-testing-assistant-tool store_origin: PL region: Poland --- # Fits M12 & M14 spark plugs 1000 PSI max pressure Steel braided hose durability Engine Air Valve Holder and Cylinder Leakage Testing Assistant Tool(Heavy Duty Hose 1000PSI) Fit with M12 or M14 Thread **Brand:** kweiny **Price:** 148 zΕ‚ **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Lock it tight, fix it right – the pro’s secret weapon! ## Quick Answers - **What is this?** Engine Air Valve Holder and Cylinder Leakage Testing Assistant Tool(Heavy Duty Hose 1000PSI) Fit with M12 or M14 Thread by kweiny - **How much does it cost?** 148 zΕ‚ 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/97870816-engine-air-valve-holder-and-cylinder-leakage-testing-assistant-tool) ## Best For - kweiny enthusiasts ## Why This Product - Trusted kweiny brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Heavy-Duty Pressure Handling:** Engineered to withstand up to 1000 PSI with upgraded steel wire braided hose. - β€’ **Precision Valve Pressurization:** Hold valves securely closed with compressed air for seamless maintenance. - β€’ **Effortless Cylinder Leak Diagnosis:** Pinpoint air leaks during compression stroke to quickly identify engine faults. - β€’ **Universal Spark Plug Compatibility:** Works flawlessly with both M12 and M14 threaded spark plugs for versatile engine fit. - β€’ **Non-Invasive Valve Seal Replacement:** Replace valve oil seals without dismantling the engine, saving time and hassle. ## Overview The kweiny Engine Air Valve Holder is a robust automotive tool designed for gasoline engines with M12 or M14 spark plugs. It pressurizes cylinders up to 1000 PSI using a steel braided hose to hold valves closed, enabling valve seal replacement without engine teardown. It also aids in diagnosing cylinder air leaks by detecting compression stroke leakage, making it an essential tool for efficient engine maintenance and repair. ## Description Buy kweiny Engine Air Valve Holder and Cylinder Leakage Testing Assistant Tool(Heavy Duty Hose 1000PSI) Fit with M12 or M14 Thread: Valve Train Tools - desertcart.com βœ“ FREE DELIVERY possible on eligible purchases Review: Works! - Used it to swap out the springs in a VW engine. Per the instructions on the box, 30-50 psi working pressure. Set the hose pressure to 30 psi and carefully opened the valve. Worked like a charm! Kept the valve closed while I swapped the springs. Glad I have this tool. Not sure how many times I will be able to use it but I'll post an update if needed. Review: Review - Works great ## Features - Main Usage 1: Pressurizes the cylinder to help hold valves closed with compressed air. So The oil seal of the valve can be replaced without dismantling; - Main Usage 2: When the cylinder is in the compression stroke. If the air tightness of the engine is not good enough, you can hear the continuous leakage of air. Diagnosis of damaged parts by listening to the leak position; - Compatibility: Suitable for the gasoline engine with M14 or M12 spark plug. The joint of this tool must be installed on the position of the spark plug; - Working requirements: Compressed air (working pressure 30psi≀P≀1000psi), Air inlet: 1/4" quick coupler male plug; - Anti high pressure: Upgraded products using improved materials 2024, Steel wire braided hose, Maximum compressive strength of 1000PSI. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07FYCSKJV | | Automotive Fit Type | Vehicle Specific Fit | | Best Sellers Rank | #476,778 in Automotive ( See Top 100 in Automotive ) #263 in Engine Valve Train Tools | | Brand | kweiny | | Customer Reviews | 4.2 4.2 out of 5 stars (471) | | Date First Available | June 20, 2018 | | Fit Type | Vehicle Specific Fit | | Is Discontinued By Manufacturer | No | | Item Weight | 5.5 ounces | | Item model number | 5824091470 | | Manufacturer | Xingzhu | | Manufacturer Part Number | XZAMR000 | | Material | Brass, Rubber | | Number of Pieces | 1 | | OEM Part Number | M12 and M14 | | Product Dimensions | 12 x 0.7 x 0.7 inches | | UPC | 781573032666 | | Vehicle Service Type | ATV, Motorbike, Passenger Car, Truck | ## Product Details - **Brand:** kweiny - **Fit Type:** Vehicle Specific Fit - **Material:** Brass, Rubber - **Number of Pieces:** 1 - **Vehicle Service Type:** ATV, Motorbike, Passenger Car, Truck ## Images ![Engine Air Valve Holder and Cylinder Leakage Testing Assistant Tool(Heavy Duty Hose 1000PSI) Fit with M12 or M14 Thread - Image 1](https://m.media-amazon.com/images/I/61BmpNZx9ZL.jpg) ## Questions & Answers **Q: Does this work on a early Chevy 5.3?** A: I used it on a 1966 283 Chevy engine. I found it easy to use and very effective. You will need a small wrench to tighten the tool into the spark plug opening. I ran about 40 PSI on the unit and left my air compressor running as needed. **Q: Will this work on a small block Chevy 350 ?** A: YES! It will work on Chevy 350, 305, any small block. The two thread sizes it comes with fits most cars. **Q: I used it, the high pressure tube blew out at 60psi on the very first use, the return window is closed, will you take it back?** A: If you're changing valve seals you only need 35 to 40 PSI. **Q: Do you make a solid tube for when the spark plug is recessed several inches? Where a flexible valve holder cannot be tightened.** A: My spark plug is recessed about an inch if that and I used an old 3/8 wrench and bent the end so that I could get in to the recessed area and tighten the fitting. You do not have to make it very tight to get a seal. If your plug is recessed several inches, then I think the only option you would have would to be make up a tube that would slide over the air hose on the kweiny and use that to tighten the fitting. Good luck, Jim ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works! *by M***. on April 22, 2023* Used it to swap out the springs in a VW engine. Per the instructions on the box, 30-50 psi working pressure. Set the hose pressure to 30 psi and carefully opened the valve. Worked like a charm! Kept the valve closed while I swapped the springs. Glad I have this tool. Not sure how many times I will be able to use it but I'll post an update if needed. ### ⭐⭐⭐⭐⭐ Review *by A***R on December 29, 2025* Works great ### ⭐⭐⭐⭐⭐ Held the valve open while I mad my repair *by A***S on September 13, 2022* Must have if you are fixing broke valve springs ## Frequently Bought Together - kweiny Engine Air Valve Holder and Cylinder Leakage Testing Assistant Tool(Heavy Duty Hose 1000PSI) Fit with M12 or M14 Thread - OEMTOOLS 25220 Overhead Valve Spring Compressor Tool, Removes Valve Spring Keepers and Springs Without Removing Cylinder Heads, Automotive Valve Spring Compressor - HW0107 Valve Seal Pliers Valve Stem Seal Removal Remover Tool 27cm Length --- ## 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.pl/products/97870816-engine-air-valve-holder-and-cylinder-leakage-testing-assistant-tool](https://www.desertcart.pl/products/97870816-engine-air-valve-holder-and-cylinder-leakage-testing-assistant-tool) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-24*