401 Steel (New Style) Extended Cup and Skirt Escutcheon 2 Piece Set, White 1/2" NPT

401 Steel Extended Cup and Skirt Escutcheon 2 Piece Set - 1/2" NPT - Available In Multiple Colors Cup Measurements: Inside Diameter - 2 3/16"Depth - 2 7/8" Skirt Measurements: Inside Diameter - 2 3/16"Outside Diameter - 4 1/2"Depth - 2 5/8" NPT stands for National Pipe Thread.  To determine what size sprinkler head you have, measure the bottom of your sprinkler head at the base of the threads.  The 1/2" fire sprinkler base measures at 3/4".  The 3/4" fire sprinkler base measures at 1". WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm.  For more information go to www.P65Warnings.ca.gov.