Glad to see that the hand with gasket kit, emergency hands for RV semi trailers compressed air hose [Glad Hands Kit] air leakage is caused by wear and aging of the sealing ring rubber, which needs to be replaced in time to ensure better tightness. The quantity of satisfied hands and satisfied hand seals can satisfy your different uses and replacement in daily life, and it is a perfect gift for technician and repair man. [High performance] hands are made of high-quality aluminum, which has good durability and corrosion resistance, which can guarantee a longer life cycle. At the same time, the high temperature resistance and low temperature resistance of the semi truck hands can work normally in bad weather and protect the safety of the trip. [Easy to operate] The glad hands is practical and easy to install, which is marked in red and blue for easy identification. The satisfied handmade compressed air hose is simple and beginner-friendly to install without other operations. [Suitable Size] Gladhand size: 4.1x2.2(LxH). Gladhand Rubber Seal Size: 1.6x1.4x0.4 inches (LxWxH). Connection size: 1/2 inch port. I am glad to see that the hand seals are compatible with SAE J318 for most trailers, semi-trailers, trucks, cargo, airlines, etc. For example, Tectran 1011EF/1011SF, Bendix 278850/278851, Velvac 035042/035045, etc. Color: Red + Blue + Black Material: Metal Package Contents: 4 * Glad Hands 12 * Gaskets Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.