Genuine OEM Sealco # 110555 Push Pull Valve 3/8" ports Works with all air suspension systems Push to manually exhaust air from air bags Pull to refill air bags from reservoir. Automatically refills air bags when trailer parking brakes are released. Commonly used with a 110587 to control the inflation & deflation of suspension air bags. Not recommended for suspensions that exhibit dock walk. Belgrade Parts & Service, Inc. Genuine OEM Sealco 110555 Push Pull Air Valve