Fireye 129-172 Spring Retainer Kit R-407C Designed as a direct HD44AE129

Designed as a direct HD44AE129 replacement and HD44AE132 replacement

the board features dedicated terminal contacts to manage circulator operation in sequence with the heating demand phases

the Yellow Jacket 21986 is specifically rated for 800 PSI working pressure and 4

preventing air binding in your steam system

Automatic stroke adaptation ensures the actuator recognizes the valve's physical limits for precise control

Fireye 129-172 Spring Retainer Kit R-407C Designed as a direct HD44AE129The Fireye 129 172 Spring Retainer Kit is a critical mechanical component engineered for the secure mounting and long term stability of flame scanners within industrial burner management systems. This spring retainer is specifically designed for use with the MB series and MBPF flame sense modules, including models MB 600PF, MBPF 100S, and MBPF 200S. Built from high temperature resistant alloy, it maintains structural integrity under the intense