Once the tire reaches its predetermined pressure the valve will automatically shut off. This inno fussin deflator has to be the easiest way to deflate any tire. Not only does the deflator have an adjustment range from 35-8 psi, these deflators are the smallest on the market. Just 30mmx15mm in size and weighing just 40grms for a set of 4, make these the smartest deflator around. Made from 100% machined brass, these deflators are also one of the fastest. On a normal 10rx15 tire they will deflate from 35-18 in around 2.5mins. Suitable for all types of 4 wheel driving, it is fast, accurate and proudly Australian made, every valve is tested and pre-set before packing.Includes 4 Staun brass tire delfators and carrying case.