You are buying a Kit which includes (2) 1 1/2" Heater Split Nuts, (4) Screws and (2) Gaskets for use with a 1 1/2" Heater Tube & Union. The Heater Flange Split Nut mounts to the heater tube using 2 screws to hold it in place and screws onto the heater threaded union with a gasket between the union and tube. If your plumbing is 1 1/2" and your heater is 1 1/2" this part is correct. This version is the 2nd most popular version. 2" x 2" is 1st most popular and 1 1/2" X 2 is 3rd most popular.This part is used in hot tubs to plumb a heater tube to a heater union. Note: The Heater tube in pictures is NOT included!!
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