CID A-A-52502B涵盖了3英寸（英寸）的要求船体排水提升阀总成，用于将水排出车辆。阀门总成由阀门、阀座、弹簧和旋钮组成。

CID A-A-52502B covers requirements for a 3 inch (in.) hull drain poppet valve assembly, which is used to drain water out of vehicles. The valve assembly consists of a valve, seat, spring, and knob.