Introduction This Adjustable Auto-Stop Tire Deflator Valve Kit (10–30 PSI) includes 4 screw-on deflators designed for off-road 4x4 vehicles. Quickly deflates tires to your preset PSI without monitoring saving time and effort. Application For all off-road vehicles Specification Material: Brass+Nickel-plated shell Adjustable Range: from 30PSI to 10PSI Error range: ±2PSI Package included 1*storagebag 4*valve caps 4*auto-stop deflator valves Dimension Length: 58mm/2.283" Diameter: 7mm/0.276" Feature Automatic Stop Deflation: Automatically releases air and stops at the preset PSI value without removing the valve core. Adjustable Range: Rotate the housing to set the pressure from 10–30 PSI no tools required. Precise Calibration: Each product is individually calibrated with an accuracy error of ±2 PSI. Durable Construction: Made of high-quality brass the housing is nickel-plated durable and rust-proof. Compact and Portable: With a storage bag it can be held in one hand and deflate four tires in a few minutes. Note It is recommended that professionals install it.