2PCS Closed Ball Air Chucks. 1/4" NPT Portable Flow Tire Chuck with Standard Quick Plug, Tire Inflator Gauge Nozzle for Air Compressor Accessories. 2 × Portable Air Chucks. 1/4-14 NPT. This enclosed ball air tire chuck is widely used for most bicycles, motorcycles, cars, trucks, buses, and SUVs, it can inflate tires quickly and make your life more convenient.