A fire department connection installation features a 5-inch Storz connection with cap and chain, a 45-degree street elbow, and a threaded 4-inch National Pipe Thread pipe extending upward through a concrete pad and finished grade. An escutcheon plate with the words "FIRE SPRINKLER" surrounds the pipe above grade, with the piping routed down to a 4-inch ductile iron main pipe. The subterranean assembly includes a service clamp and coupling, a half-inch ball drip valve connected to a copper pipe, and a concrete thrust block bearing against undisturbed earth over crushed stone wrapped with filter fabric.
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