Sprinkler main drains and trap primer valve discharge into two-inch sprinkler pipes, routing into a six-inch waste stack with a fire department test drain connection. A separate assembly shows a three-inch vent pipe fitted with a wall cleanout.
SPRINKLER MAIN DRAINS FROM TRAP PRIMER VALVE FIRE DEPT. TEST DRAIN 2" SPR 3" VENT WCO 6" WASTE
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