The Automatic HD tire inflation cage 78" OD offers top-of-the-line protection for your employees when inflating truck & bus, agriculture and off-the-road tires. Equipped with locks and safety valve systems on each door, the Automatic HD tire inflation safety cage series exceeds OSHA standard 29 CFR 1910.177 in the U.S. In addition to its sturdiness and safeness, the 78” OD HD tire inflation cages offer easiness, accuracy and versatility with a plug & play automatic tire inflator that is equipped with an over pressure system.Before using the product, please read the instructions carefully.*Air compressor required