HEAVY DUTY: CZC AUTO closed flow air chuck uses premium solid brass construction, durable. Maximum pressure is up to 250PSI, heavy duty.CLOSED FLOW: Closed flow tire chuck is designed for slowly inflating, with shut-off valve inside. The air only passed when the air chuck is engaged with a tire valve.FITTMENT TYPE: 1/4" female NPT, 3/4" hex, compatible with most tire inflator, wheel pressure gage and compressor. Straight chuck tip is suitable for all vehicles.LOCK ON CLIP: When use the air chuck to inflate a tire or measure pressure, please use the lock-on clip to secure the chuck to the valve stem for sealing, no thread fixation is required, very handy.CLIENT SUPPORT: 30-day money-back for any reason, 12-month warranty for quality-related issues. Please feel free to contact us at first if there is any problem when you receive or use our products. We are always here to support you. Product Description CZC AUTO Heavy Duty Brass Air Chuck, Closed Flow Straight Tire Chuck with Lock-on Clip, 1/4" FNPT Tyre Chuck for Tire Inflator Pressure Gauge Air Pump Compressor Accessories, 2 Pack Straight brass air chuck Brass air chuck, rated pressure up to 250PSI. Straight chuck tip, compatible with valves for all vehicles, such as car bus trailer RV motorcycle bike (with schrader valve) Closed flow air chuck Closed flow, with shut-off valve inside, air only passed through when the air chuck is engaged with a tire valve. 1/4" FNPT, 3/4" hex 1/4" female NPT, 3/4" hex, total 1-5/8" long, compatible with most tire inflator, wheel pressure gage and compressor accessories. Lock on clip When use the air chuck to inflate a tire or measure pressure, please use the lock-on clip to secure the chuck to the valve stem for sealing Material Brass Brass Chrome-plated iron stem, zinc alloy head Brass Size 1-5/8" long 1-5/8" long 6-3/8" long 2-1/4" long Connector size 1/4" FNPT, fit for 1/4" MNPT fittings 1/4" FNPT, fit for 1/4" MNPT fittings 1/4" FNPT, fit for 1/4" MNPT fittings 5/16" barb connector, fit for 1/4" ID hose Air chuck Straight air chuck Straight air chuck Dual heads with straight chuck and 30° reverse chuck Angle ball air chuck Feature Open flow w/o shut off valve inside Closed flow w/ shut off valve inside Closed flow w/ shut off valve inside Closed flow w/ shut off valve inside Function Compatible with tire pressure gauge and inflator Compatible with tire pressure gauge and inflator Compatible with tire inflator Compatible with tire pressure gauge Usage for the chuck tip Push and lock by the clip Push and lock by the clip Push-pull chuck Push-pull chuck