Walraven 2151015017 is a WM Pacifyre MKII intumescent fire collar for sealing plastic conduit and small pipe penetrations of 15-17 mm outside diameter. On exposure to fire the intumescent lining expands and crushes the plastic pipe to close the aperture and restore the fire resistance of the wall or floor. It is fitted around the pipe and secured with the supplied banding to the tested penetration seal detail.