Hot Tub 1 ½” Heater Union Split Nut for Spa (Measures 2 ½” Outside Diameter)

You are buying a 1 1/2″ Heater Split Nut Only which includes the split nut and (2) Screws for use with a 1 1/2″ Heater 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 part is used in hot tubs to plumb a heater tube to a heater union.