A heatproof silicone collar (master flashing) for use with the 1mm aluminium Collar Back Plate. Combined together, these items clamp onto the canvas, sandwiching the canvas between them.
The aperture for the flue pipe can then be cut to allow the fluepipe to pass through the canvas roof. Fits perfectly with the Collar Back Plate.
Suitable for use with flue pipes with a diameter of 102-178mm / 4"-7" diameter.
LOW TEMP RESISTANCE