Hello! I am trying to find out what the difference is between a robertshaw ts-11j and ts-11k. what I am confused about is the 11j has a pilot ''in and ''out and the 11k has only the pilot ‘‘out’’… the 11k is easy for me because the pilot out goes directly to the pilot/thermocouple but I can’t figure how to connect a pilot in/out valve what type of applications are these used for?
thanks