Royal Group Technologies Inc.

Brian M Didone

Manfred Harle

A coupler which is used in coupling plastic conduit through a separation in a building has plastic end regions for an overlapped accurately positioned sealed coupling with the plastic conduit to each end of the coupler. The plastic end regions are separated by an intermediate region formed by a wall of plastic based intumescent material which defines a fluid flow passage through the coupler. The fluid flow passage wall has a sufficient thickness of the intumescent material to produce a complete blockage of the passage when the coupler is subjected to conditions which cause an intumescing of the intermediate region wall material.

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Georgetown, Canada

Brian M Didone