You are shopping for a 2″ heater split nut which contains the split nut and (2) screws to be used with a 2″ heater union. The heater flange split nut mounts to the heater tube the use of 2 screws to carry it in place and screws onto the heater threaded union. If your plumbing is 2″ and your heater is 2″ this part is proper. This version is the preferred version.
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2 1/4″ Inside Diameter that matches across the tube..
Fits Some 15″ X 2″ Spa Heater Unions
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