A,no leakage, wonderful seal property. B,no abrasion means ... ITHE STRUCTURE OF THE TWIN SEAL GUIDE WAY VALVE.Characteristic:A, no leakage, wonderful seal property.B, no abrasion means ... plug and 90.Rotation, the twin seal guide way valve can be opened and closed freely. When the plug rotates clockwise ... ; conversely as it rotates anti-clockwise, the valve can be closed. And it requires up to 5~7tures ...