NorthStar Replacement Pump Head - 1/2in. NPT Ports, 5.5 GPM, 60 PSI, Model# A2685561 Fits Item# 2685561, 2685562, 2685563 and 2685564 Automatically turns off when no flow is required to conserve battery power 100% continuous duty rating Roundup ready Honeywell MICRO SWITCH for enhanced durability and efficiency