This kit is a 2" Spigot X 2" Slip Slice Gate Valve and 2" Heater Union with Gasket or Oring that matches Union. The Valve recieves a 2" pipe or fitting on one side and then slips inside of a 2" fitting on the other side. It will slip inside of the Heater union and glue and screw to a 2" Heater Flange fitting. Don't be confused we also offer a slice valve with a Pump union look at where it it attached in the spa if it is attached to the Heater and the plumbing is 2" and the Heater Split Nut threads are 2" then this part is correct. This part is used in hot tubs to stop the water so you could service the heater or the pump without draining the tub. We have done a lot of extra work with videos and pictures to prevent you from choosing the wrong part. To See the Information Video for this Union go to YouTube and look for: 2" Hot Tub Pump & Heater Union Gaskets How To The Spa Guy Note: Colors May Vary it could be white or black..