The AstroAI Open Flow Air Chuck fits most inflators, but is designed specifically for use with AstroAI tire inflator gauges. The brass chuck design inflates tires easily, even on heavy-duty work vehicles thanks to a 250 PSI maximum pressure rating. There's no need to thread the chuck to valve stems, because a locking clip securely seals the air chuck into place on a valve stem. A straight tip makes inflation hassle free. Package Content: 2 x AstroAI Air Chuck