Alternatively, when split in two and by the addition of flanges, it can be clamped onto a continuous pipe.
Inspect the flange: if it looks damaged it may need to be replaced.
Keep bending the flange until it conforms to the outer perimeter of the chimney crown.
The widely separated flanges give it the best profile for resisting the bending action of beams or the buckling action of columns.
For most items it is best to support the mold just under the flange so that it is suspended.
Notch it so the end can be bent outward to create a flange to attach it to the bottom of the trap.
If you have access to a wrench that will hold the flange to prevent it from turning, you can tighten the assembly enough to compress the new crush sleeve (it requires between 380 and 410 foot-pounds of torque, so it is very difficult to set the crush sleeve with ordinary tools).
Holes in the flange fixture allow it to be positioned over the circular tube with threaded rods.
This is a competitive alternative to the common ring flange connection as it has been shown in the European Project "HISTWIN".
