The McDonnell & Miller 157S-RL (Part Number 176902) is a heavy-duty combination low water cut-off and pump controller designed explicitly for steam boilers with an integral water column

By installing this corrosion protection rod

By creating controlled turbulence

technicians and homeowners can ensure the fan-powered unit remains level and securely suspended from floor joists

preventing hazardous flue gas bypass and maintaining precise HVAC manifold pressure

BROAN-NuTone S87547000 Motor 326058-756 The McDonnell & Miller 157S-RLFor contractors and HVACR technicians, the Broan Nutone S87547000 motor is a direct replacement engineered for reliable ventilation system performance. This C Frame motor 120V operates at 120 Volts, 1. 2 Amps, and 60Hz, delivering a consistent 3000 RPM with a Counter Clockwise (CCW) rotation. Designed for seamless integration, it features a 7 32" x 1 3 8" shaft, a 3 4" stack, and two mounting studs on the rear for secure installation. This Broan