Metal spacer for pipes forming especially central heating flue passing through house loft

摘要

The spacer is bent through an arc which follows approximately 20 per cent of the circumference of the inner pipe, before crossing the gap to the outer pipe where it follows approximately 10 per cent of the inner circumference, before bending back to meet the inner pipe. This pattern is repeated three times, maintaining the two pipes in a co-axial arrangement. The spacer inner circumference has a series of recesses which receive locking nipples protruding from the outer face of the inner pipe.