Armstrong Fluid Technology 805188-111 Flange Kit 322838-753 Secure Fixation: The locking collar

Secure Fixation: The locking collar ensures a tight grip on 1-inch shafts

The Setra 2641R25WB11T1C is a industry-standard low differential pressure transducer designed for precise monitoring in high-stakes HVAC environments

The Warrick AM1A2 Alternator is a specialized solid-state alternating relay designed for industrial duplexing applications

Always verify your unit's series number before installation to ensure the PWM signal and voltage requirements match

If you observe downstream pressure creep (where the pressure rises while no water is running) or if you see water leaking from the spring cage weep hole

Armstrong Fluid Technology 805188-111 Flange Kit 322838-753 Secure Fixation: The locking collarThe Armstrong Fluid Technology 805188 111 Flange Kit is a professional grade solution designed for seamless integration into high performance hydronic and HVAC systems. This 3 inch cast iron flange kit serves as the direct, modernized replacement for the legacy 105188 011 model, ensuring long term reliability and leak free operation. Engineered specifically for circulating pump installation, this kit is compatible with Armstrong Series E. 2 pumps,