Mcdonnell And Miller 171802 Combination Float Type Low Water Cutoff & Pump Controller

with maximum differential operation that prevents nusance burner shut-down in low pressure applications on steam boilers with a separate water column. Automatic reset, (2) 120 volt bi-metal snap switches, 1 single pole, single throw for pump control and 1 single pole, double throw for low water cut-off and alarm actuation. Maximum pressure is 50 psi. Tapped 1″ female IP.