[WITH 2 EXTRA SEALS]- Leakage is usually caused by the wear of high quality material. The extra washers keep the glad hands in excellent working condition. This is a very cost-effective solution. [NO-LEAK]- High hardness steel clamp plates, port thread machined by lathe, smoother. They that glad hands are tightly connected under strong air pressure. Gaskets are made of high-quality rubber, the aging resistance is very strong, prevent air leakage efficiently. Work well under long-term weather changes. Gladhands are color coded red & blue for easy identification. [SIZE & QUANTITY]- Connect size: 1/2 NPT port, Dimension: 4.1inch x 2.2inch. [WIDELY USED]- Service and Emergency configurations (polarized) or Universal (non-polarized). Replace for 1011EF / 1011SF, for Velvac 035042 / 035045, for 278850 / 278851 and so on. color:Red+blue Material:aluminum Package Contents: 2 x glad hand seals 4 x O rings Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.