13" Dual Head Air Chuck Set, Heavy Duty Extended Reach Tire Chuck w/Quick Plug for Semi Tire Inflation, 1/4" FNPT Straight Lock On Tire Inflate Chuck for Air Compressor Semi Truck RV Dually Tires. 12" Dual Head Air Chuck Set, Heavy Duty Extended Reach Tire Chuck w/Quick Plug for Semi Tire Inflation, 1/4" FNPT Straight Lock On Tire Inflate Chuck for Air Compressor Semi Truck RV Dually Tires.