Dual Gauge Design: The charging valve is designed with double pressure gauges, easy recognition. Quick Release: The charging valve is easy installation and it can effectively filtering the impurities in the gas. High Quality Material: The dual gauge charging valve is made of premium copper, aluminum and stainless steel. Easy Using: The air filling station refill adapter is easy using, very portable. Suitable For: This charging valve is suitable for filling the tank, fire fighting tank. Specification: Material: Copper Aluminum Stainless Steel Size Chart: Tube Length: 24 Tube Diameter: 0.24 Package Includes: 1 Charging Valve Note: 1. Please allow slightly error due to manual measurement. 2. Due to difference between different monitors, the picture may not reflect the actual color.