GOOD SEAL CHUCK: The locking air chuck built with 3 claws that quickly lock on to tire valve stem by a simple push. Pull back to release,no air leaking. CLOSE FLOW AIR CHUCK: air chuck with a shut-off valve inside that do not allow air to flow to or from chuck unless chuck is engaged with a tire valve stem, which makes them more efficient for using directly on an air compressor hose line. FAST TO LOCK ON: A locking device on chuck bitten tire valve stem so it can be used without hands holding, make your hand free. Just check tire pressure and add air as needed. HEAVY DUTY AIR CHUCK: great for inflating /truck/RV tires with air compressor. WIDELY APPLICATION: Standard 1/4FNPT locking air chuck means it fit with standard air compressor fittings or fillers. There is a reason these get used a lot on 4-tire inflator/deflator setups. CLOSE FLOW LOCK ON AIR CHUCK Lock On Air Chuck, Good assistant for tire inflation Product : 1. Closed flow air chucks 2. Better Auto-Locking 3. Quick Connect Air Chuck 4. 1/4inch FNPT Thread Universal Connect. 5. Standard bore size fit for Schrader Valve (0.305'OD) 6. Maximum pressure: 150 PSI 7. Heavy Duty Design-made of steel and zinc, anti-rust Close Flow Air Chuck CLOSE FLOW TIRE CHUCK a shut-off valve inside, air doesn't flow unless it's feeding into valve stem, which makes them more efficient for using directly on an air compressor hose line. Heavy Duty Design Heavy duty brass & nickel plating three claws air chuck easier locking onto stem valves - no air leakage ever since. 1/4inch FNPT Thread 1/4inch FNPT Thread Universal Connect, compatible with most tire inflator air compressor. Better Auto-Locking Just pushed forward sleeve to lock valve stem and pulled back sleeve to release lock on air chuck, it keep your hands free while tire is inflating or deflating. Color: As Shown Material: plastic Package Contents: 2 * Air Chuck Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.