The "U" suffix typically denotes "Unitized" or standard retail packaging

polytubing connections

Utilizing a robust winding configuration and precision-balanced rotor

ensure the seating surface is free of debris and pipe dope

Weil McLain 511-405-006 Ciculator Cartridge Els PW 17895 The "U" suffix typically denotesThe Weil McLain 511 405 006 Circulator Cartridge is a field proven OEM replacement part engineered specifically for high efficiency AHE Boiler models. Designed for professional hydronic applications, this wet rotor circulator cartridge replaces worn motor assemblies without requiring a full pump housing teardown, saving significant bench time on the job site. The assembly features a high grade centrifugal impeller and water lubricated bearings that