Cast iron drain / waste pipes they are most often joined with a lead and Oakum seal. Oakum is a hemp material coated in tar.  It is placed into the joint to seal it.  Oakum expands when it gets wet to seal the joint. The Oakum is held in place and the pipe joint is given some strength by casting a bead of lead around the pipe inside the hub socket. In this picture the cast iron pipe hub is on the left.

Research Links


This is how the pipe joint is put together originally – Pouring Lead Joint Horizontal


Replace or Join Cast Iron Drain Pipe with ABS or PVC

   Useful note: When cutting cast iron drain pipe a diamond or carbide blade is required.


How to easy cut & removal of Cast Iron Pipe – cutting with special cutter – Soil Pipe Cutting Tool


RIDGID Powered Soil Pipe Cutter Video – Demo cut


Demo of RIDGID 246 Soil Pipe Cutter

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