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This air filling adapter was designed for converting tire inflator's twist-on air chuck to lock-on air chuck, All metal construction, portable tire inflator air filling chuck, for bike, motorcycle, car etc. Open flow 90 degree thumb-up air chuck, easy and quick hands free inflation. Excellent tight seal lock-on air chuck, make sure no annoying air leaking.High quality strengthen nylon-wrapped rubber hose, durable and flexible.Standard us fine thread connection(0.305"x32TPI), the same as the thread on all USA standard car valve stems, compatible with inner thread of twist-on air chuck(please refer to the left second picture). Convert tire inflator twist-on air chuck to lock-on air chuck. Use under 200psi, heavy truck/vehicle forbidden. Buy with confidence, 100% satisfaction customer service.