If you are sure you have your existing Aquastat manufacturer number this is a complete replacement. It comes with a temperature rise gel that you are supposed to place in the aquastat's well to improve performance and I did so the first time I replaced it but have found the gel to harden over the years was and I was struggling to pull the old temp lamp out of the building and I was afraid it would break inside. I didn't use it this time and everything was fine. The only thing I would wish for is a manufacturer's warranty, which I don't know about yet. The last one is 8 years old, I hope this one lasts the same.
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