This Grooved Flange Adapter features one 10 in. connection to be used in grooved piping, including specifically fire sprinkler piping systems, allowing for proper water flow and fast installation. This flange adapter nipple is available in the following sizes: 2 in., 2-1/2 in., 3 in., 4 in., 5 in., 6 in., 8 in., 10 in.