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This part is a 2" Slip X 2" Heater Union with Gasket or O-ring that matches Union. The Union receives a 2" pipe or fitting on one side and then Screws to a 2" Heater Flange Split Nut on the other side. It will Glue to a 2" Pipe or Slice and screw to a 2" Heater Flange fitting. Don't be confused we also offer a Heater union that is 1 1/2" Slip X 1 1/2" to Heater or a 1 1/2"; Slip X 2"; Heater Union. If your plumbing is 2"; and your heater is 2" this part is correct. This version is the most popular version. 1 1/2 x 1 1/2 is 2nd most popular and 1 1/2" X 2 is 3rd most popular. This part is used in hot tubs to plumb to a heater flange. Buy with caution look at the measurements and pictures. Note: Colors May Vary it could be white or black..