This technician-grade replacement board (Revision R) is the direct superseding part for legacy numbers 626421

also recognized by industry cross-references 1219-13004 and 2802-001

This lead-free boiler pressure relief valve is engineered with a lead-free copper silicon alloy body to ensure durability and compliance in various installations

OEM Reliability: Sourced directly for Commercial HVACR technicians needing guaranteed part specifications

Armstrong International B2721 Contactor Refrigerant This technician-grade replacement board (RevisionThe Armstrong International B2721 is a high performance 50 Amp Contactor designed specifically for heavy duty industrial and commercial humidification systems. Engineered for precision and longevity, this replacement HVAC contactor serves as a critical component in managing power distribution for Armstrong steam humidifiers. It is fully compatible with EHU 600, EHU 601, EHU 602, EHU 701, EHU 703, and EHU 704 models, as well as the HC Series