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This will most likely be a stupid question, how does this fitting work? Do I literally just thread it on my pipe? What kind of connection is this called? Thanks

Hello, I’ve just moved house and found myself with a Ideal Mexico Super ideal C125 boiler, Horstmann 425 control and Sunvic thermostat. I’d like to replace the control for a hive but need some assistance with the wiring please. I’ve attached a couple of pictures. Thanks in advance! David