Use wherever dissimilar metals occur in piping and plumbing systems or where an electrically insulated connection is required, such as water storage tanks, gas piping, air conditioning, water conditioners, oil piping, plating tanks, water pumps and steam lines. Standard 1/2" measures 1-3/16"OD x 3/4"ID x 3/32" thick, standard 3/4" measures 1-3/8"OD x 15/16"ID x 3/32" thick. Bagged.