Professionals should note the 5

5" WC manifold pressure settings for optimized two-stage heating cycles

preventing water carryover and potential property damage

Designed as a direct replacement pressure switch for the obsolete 261R06830004 kits

McDonnell & Miller 354089 Switch Assembly 322056-301 Professionals should note the 5The McDonnell & Miller 354089 Switch Assembly, also designated as the Model SWA 150S M, is a critical replacement component engineered specifically for Series 150S and 157S low water cut offs and pump controllers. For technicians servicing steam boilers, this snap action switch assembly is the standard for maintaining precise liquid level control and ensuring high limit safety. Featuring a manual reset mechanism, this assembly requires professional