1" spiggot end plug used to blank off a section of 1" plumbing.
1.5 Inch heater O'Ring Gaskets - Sold in individually
Spigot fits inside a 2" fitting, providing a 3/4" smooth barbed fitting for 3/4" vinyl pipe to be glued onto.
Spiggot fits inside a 1" fitting, providing a 1/2" socket for a 1/2" pipe to be glued inside.