Specification Brand : American Spa Parts BulletPoint1 : 2" Threaded Female Pump Side that would measure about 3" Inside Diameter.. BulletPoint2 : 2" Slip Glueable Side would measure about 2 3/8" Inside Diameter.. BulletPoint3 : Comes with O-Ring BulletPoint4 : Fits Most Spa 2" Wet Ends BulletPoint5 : Fits Most Spa Pumps There are Exceptions Like Hayward Pumps ExternallyAssignedProductIdentifier1 : 0740016010234 ExternallyAssignedProductIdentifier2 : 740016010234 ItemName : Set of (2) Hot Tub Spa 2" Slip X 2" Threaded Pump Unions ItemPackageDimensions_Height : 5 inches ItemPackageDimensions_Length : 5 inches ItemPackageDimensions_Width : 5 inches ItemPackageQuantity : 1 ItemShape : Round ItemTypeKeyword : swimming-pool-and-spa-replacement-parts Manufacturer : American Spa Parts Material : Plastic ModelNumber : ASP21023-000-0002 PartNumber : ASP21023-000-0002 ProductDescription : This Kit is a Set of (2) 2" Slip X 2" Pump Union with Gasket or O-ring that matches Union. The Union recieves a 2" pipe or fitting on one side and then Screws to a 2" Wetend(Pump) Threaded Part on the other side. It will Glue to a 2" Pipe or Slice and screw to a 2" Wetend fitting. Don't be confused we also offer a Pump union that is 1 1/2" Slip X 1 1/2" Pump Wetend or a 2" Slip X 2 1/2" pump Union. If your plumbing is 2" and your Pump Wetend Thread is 2" this part is correct. Also if your Pump is 2" and Your Plumbing is 1 1/2" You can use a 1 1/2" To 2" Bushing to make them fit together. This version is the most popular version. 1 1/2" x 1 1/2" is 2nd most popular and 2" X 2 1/2" is 3rd most popular. The pictures also show a wetend so you can see what this part screws to. The Wet End is NOT Included in the sale. This part is used in hot tubs to plumb to a Pump Wetened Fitting. Size : 2"