what's the best way to fit an inspection / rodding hatch to a cast iron downpipe?
I can cut the pipe with an angle grinder, but how do I attach and seal a hatch? it's a 3 inch diameter cast iron waste water & rain gutter pipe in the twin stack system of a three story tenement flat.
is there something I can use in PVC / plastic ?
how about achieving a permanent waterproof seal ?
TIA
-A-