Firestop fitting for carrier mounted water closets

Claim 1

An improved one piece fitting for a fluid connection to a water closet which is supported on a carrier mounted on a floor of a building and which fitting prevents spread of fire between the floor of the building through a plastic pipe connected to the fitting which comprises: (a) a non-flammable, fluid carrying main conduit having a first longitudinal axis between two opposed openings defining an inside diameter of the main conduit and an enlarged chamber between the openings and adapted to be connected into plastic pipes between floors of a building; (b) a non-flammable extension conduit from the enlarged chamber of the main conduit positioned with a second axis at an acute angle from the longitudinal axis of the main conduit with an opening; (c) a non-flammable plug having a diameter larger than the inside diameter of the main conduit and smaller than the enlarged chamber mounted in the extension conduit on a plastic support mounted on the extension conduit which is releasable by melting upon exposure of the support to heat less than necessary for heat destruction of the plastic pipe to which it is adapted to be fitted through the main conduit from a fire in the building in which it is adapted to be provided to thereby move into and close the main conduit, wherein the plastic support is provided by a harness with a strap upon which the plug rests, wherein the harness has two straps which are overlapping in an x pattern joined to a holding ring which is mounted inside the extension conduit and wherein the strap is broken by heat from a fire to release the plug which moves by gravity into the main conduit; (d) closure means for the extension conduit opening; (e) a short pipe connected to a side opening in the main conduit in the enlarged chamber for fluid connection to a water closet; and (f) attachment means on the fitting for connecting the fitting to the carrier.