I have a copper stack pipe coming down from upstairs washrooms leading into a cast iron drain line that ultimately goes through the basement and out to the septic tank. It looks as though the copper stack was simply run into the cast iron drain with some kind of sealant. At this point it appears that the sealant has deteriorated and even vanished in a couple of spots. The question is: What kind of sealant should I apply to this joint that will KEEP it sealed? Not sure how replies to such questions work on this website; my email address is [email protected]. Many thanks!

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Originally Posted by ;

The question is: What kind of sealant should I apply to this joint that will KEEP it sealed?

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You're going to love this. There's a product on the market that fits your needs to a tee. It's called Soil Seal. (see image) You may purchase it at;
Soil Seal
Simply cleann out the old seal and follow directions. Good luck, Tom

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Originally Posted by speedball1

You're gonna love this. There's a product on the market that fits your needs to a tee. It's called Soil Seal. (see image) You may purchase it at;
Soil Seal
Simply cleann out the old seal and follow directions. Good luck, Tom

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Bingo! Many thanks for great info, Tom! I couldn't find the Harvey brand, but True Value Hardware had its own brand that, according to my son who helped me out, worked perfectly! I'd never heard of a product like this: 'synthetic lead.' The instructions called for using oakum, which was necessary because of the size of the gap between the copper and the cast iron. Now, finding oakum was a challenge... Local hardware store owners looked at me either blankly or strangely, maybe because cast iron soil pipes and real lead aren't used much anymore. Finally found a store that had a one-pound package buried in the back somewhere, but that was all I needed. Now, what to do some 14 oz. of leftover oakum... Thanks again!