a clogged or cracked suction tube prevents the inducer's negative pressure from reaching the switch diaphragm

allowing for straightforward inventory management and replacement

This 100 cubic inch block is a single unit

This part is commonly found in Lennox GHR26Q2-50 and GHR26Q3-100 series units

they are identical units

McDonnell & Miller 351800 Hook-Up 30067439-890 a clogged or cracked suctionThe McDonnell & Miller 351800 Hook Up (Model SA259 24) is a critical upper quick hook up fitting designed for seamless integration with Series 47 and Series 47 2 mechanical water feeders. This professional grade component also serves as a direct replacement part for Series 42S A, 42A, and 64 A low water cut offs (LWCO). By utilizing this specific boiler control fitting, technicians can ensure precise water level monitoring without the intensive labor