An auxiliary inlet fitting for a trap primer connects with a half-inch trap primer line into a six-inch cast iron P-trap resting on a four-inch concrete pad. The assembly includes a six-inch by four-inch cast iron increaser, a three-foot length of six-inch cast iron soil pipe topped by a four-inch nickel bronze strainer, and a two-inch drain line from the sprinkler system above. A parallel vertical stack incorporates a cleanout and a three-inch vent pipe connected via cast iron piping and couplings.
2" DRAIN LINE FROM SPRINKLER SYSTEM 3" VENT CLEANOUT FINISH FLOOR 4" CONC. PAD 6" C.I. P-TRAP 6" W 1/2" TP AUXILLARY INLET FITTING FOR TRAP PRIMER 6" x 4" C.I. INCREASER 3 FT. LENGTH OF 6" C.I. SOIL PIPE 4" NICKEL BRONZE STRAINER
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