Watts N50-D - Part of the N50 Series Z100F-4NH The maximum pressure rating is

The maximum pressure rating is 200 psi (13

ZM400S-4NH

and the unit is available in multiple outlet sizes for installation flexibility

Z453-3NH-7B

Watts N50-D - Part of the N50 Series Z100F-4NH The maximum pressure rating isThis dual switch assembly low water cut off is used on heating applications for low pressure, process, hot water heater boilers to protect them against emergency low water conditions. It has a float chamber that has 1 inch NPT female top and bottom connections. This is a double switch assembly. It is for line voltage burner service and independent low (or high) voltage alarm, feed valve or pump starter. Features Used on low pressure process boilers