Terminal Block for the Skuttle steam humidifier. These two terminals are used to connect the humidifier to a 24 vac humidistat. Overall size is 1 x ¾ x ¾ inch. The terminals are spaced 7/16 inch on center. Mounts in two 5/16" holes spaced 7/16" with two spring retaining clips.
For a wiring diagram see page 4 of the Skuttle Wiring Manual.