ABSTRACT
Note that the fitting outlet sizes on Line “A” are 1′′, to be used for the drops to the pendent heads. The outlet sizes on Lines B, C, and D are 1/2′′ for the upright sprinkler-heads that will be screwed directly into those fittings. When largeorifice sprinklers are used, these outlet sizes would have to change to 3/4′′ to accommodate the larger thread size of the large-orifice sprinklers. Always double-check these typical fitting sizes on your stocklist.
