AP01 2X Secondary Air Injection Pump For 911 95B959253 This secondary air injection pump is designed to fit the specified model with 95B959253.It functions as a direct replacement for the component, supporting proper emission control system.The unit is engineered for durability and consistent performance under normal operating conditions.Installation is straightforward, aligning with the existing mounting configuration.This pump assists in reducing exhaust emissions during engine warm-up by injecting air into the exhaust to promote further combustion of unburned gases.