So, this sewer stopper thing, I am not 100% on what it is. Will an expandable pipe plug work?

The sewer plugs are used for 3" or 4" pipes when pressure testing new homes for plumbing leaks (missed glue joints, etc) as part of the building inspection process. They look like short thick rubber balloons, that you inflate with air. Might be able to find at Lowes or Home Depot, but most plumbing supply shops have them. The tails usually have water exit ports cut into the main 4" tube - you need to seal those ports. These rubber plugs are a couple of inches long, so you would position the plug inside the 4" pipe so that it covers these water exit ports, and then inflate the plug (with air) so that it seal off those ports. You would then pressurize the tail with either water or air (depending how you want to test - if you use air, you would then submerge the tail in a tub of water and look for bubbles, if you use water, you connect the tail to the garden hose using the inlet bung, and look for water leaks). You wil need to make either an air hose adaptor to go into the inlet bung (where the header to tail jumper hose is normally connected) or a garden hose adaptor, if you want to use water to test. Hope this helps.

Water leaks with these headers brings out a lot of emotion in a lot of folks on here.

I found one of those things at home depot. $28....I guess it is worth it though!

Well, I would like to thank you guys for the help!! Looks like just one leaker! Now.....repair or replace? It is a small spot on a weld near the flange. I think it can be fixed....what would you do?


Oh....and this is what I ended up using/making to test the tails......

Paul if you need it fixed and it's not a crazy contortionist angle just send it to me I'll fix it and send it back. Merry Christmas bud ttys

If you can fix it without getting a lot of heat into it, that is what I would do. Check the flange face for flatness after you are done. May need to have someone face it .... that is what my friend had to do after he welded all of the leaks on the header side flange face. We put water pressure to the header and it looked like it was "crying" at all of the pinholes on that face and several of the start/stop points of the factory welds at a variety of other places. He basically dug out the crap at the flange face, did a really nice job with a tig torch, and then re-faced the flange. No more leaks on that one! Unfortunately, over the past 13 years, he has repaired several leakers. He is an amazing welder/fabricator ... not much he can't do with a torch!