Oatey Hercules 25215 Plastic Seal Caulk and Seal Compound, 10.3 Ounces

I used this sealant to fix a separated lead sewage pipe/toilet flange joint. No leaks so far, and it's been more than a year !

Great stuff for sealing PVC pipe into cast iron drain stack. I replaced some old galvanized drain lines with new PVC pipe and used this stuff to seal the joints into the cast iron bell housings. Also used it to reseal all the original cast iron bell housings joints (cast iron to cast iron). I used a wire brush to clean joints ahead of time - no leaks anywhere. Be careful to let it cure overnight before using the drains. Also before inserting the new PVC pipe into the old cast iron bell housing put about an inch wide sealant bead starting about 3/4" from the end of the PVC (very important) of a generous thickness then insert the pipe into the cast iron housing. This will create a good seal. Make sure the pipe goes the whole way in to the back of the bell housing. This should give you the start of good bead on the outside of the bell housing. then add more sealant to give you a thick wide seal the whole way around the bell housing and PVC pipe. I made the mistake of force packing the sealant into the the joint and ended up clogging the pipe with sealant even though the pipe was seated completely into the back of the bell housing. Hence the technique described above. My DIY project was 4 new drain lines and 8 cast iron to cast iron joints.

Half of the tube had started setting up and was not useable. I was able to drill through the hard portion and use the remaining product to complete my cast-iron soil pipe repair. The product did complete my project with no leaks. I do recommended this as a replacement for lead and oakum.

Used this to seal an almost 2 foot crack on the top of one my indoor septic pipes. Results in a hard, yet flexible rubbery-plastic seal that bonded well to my old iron-cast piping. So far, so good. Highly recommended for iron cast piping, despite its product name.

Packed with oakum in layers as instructed and sloped the plastic seal to make up for the pipe cut, works like a charm!