You are buying on a 2" Spigot X 2" Slip Slice Gate Valve. The Valve recieves a 2" pipe or fitting (Which is about 2 3/8" Inside Diameter) on one side and then slips inside of a 2" fitting (Which is...
"Magicmend" Pipe extenderSimply cut the bad fitting and remove it from the system. Glue the correct size Magicmend into place and replumb your new fitting
"Magicmend" Pipe extenderSimply cut the bad fitting and remove it from the system. Glue the correct size Magicmend into place and replumb your new fitting