Watts 0383368 Valve Els PW 29614 which covers the majority of which covers the majority of standard saturated steam service requirements at 150 PSI GC Valve designs allow for the Class F solenoid coil to be replaced or swapped without breaking the 3 8" NPT pipe connections the Watts 740 series iron body valve is strictly designed for non potable hot water space heating boilers and should not be used in domestic water applications The non metallic disc to metal seating ensures a positive seal while preventing the disc from sticking or freezing to the seat after long periods of inactivity—a common failure point in residential and commercial hydronic systems