John Kogel Posted August 9, 2016 Report Share Posted August 9, 2016 I am doing my rough plumbing for an addition to my bungalow. The new pipe from the suite, Kitchen and bathroom with a tub, is a 4" PVC pipe. I located the main pipe from my 1983 house today and was a bit surprised to see a 3" black pipe. It looks like PVC and is thin like PVC, but I will know for sure when I cut it. So to connect to the 3" pipe, what fittings are best? Choice #1 Reduce the 4" PVC to 3" ABS, with a 3" 45 degree facing down, short stub to street elbow into a 3" Wye. #2 From the 45 facing down, a short stub into a 45 and a sanitary Tee. #3 Stay with 4" PVC past the first 45, then reduce going into the 3" pipe. I'll use a Fernco connector to put the new fitting into the old pipe. Which way is bettter? #4 I know the best choice would be dig out the 3" and go 4" to the main sewer line. But I hope to avoid that digging and landscaping. Click to Enlarge 96.68 KB Click to Enlarge 92.2 KB Link to comment Share on other sites More sharing options...
inspector57 Posted August 9, 2016 Report Share Posted August 9, 2016 If you reduce it, be sure to leave it open since that is where it will clog.[:-censore Link to comment Share on other sites More sharing options...
kurt Posted August 9, 2016 Report Share Posted August 9, 2016 Fernco with the stainless sleeve is fine for joining the pipe; the steel sleeve keeps everything aligned. I'd not like reducing it, but I'd dislike digging up the entire yard even more. Whatever you do, put a cleanout that stubs above grade upstream of the reduction. Link to comment Share on other sites More sharing options...
Trent Tarter Posted August 9, 2016 Report Share Posted August 9, 2016 If it were me I would see if 3" ABS/PVC will fit through the 4" PVC. If it does, I would sleeve it and replace all the 4" with 3" and eliminate the need to reduce drain size. Link to comment Share on other sites More sharing options...
John Kogel Posted August 10, 2016 Author Report Share Posted August 10, 2016 If it were me I would see if 3" ABS/PVC will fit through the 4" PVC. If it does, I would sleeve it and replace all the 4" with 3" and eliminate the need to reduce drain size. Thanks but I won't do that, as I have brought the pipe around from the back of the house already, 70 feet of 4" already laid. Is Broughten a word? Why, well there was this giant tomato plant that had to be given a home right over my pipeline. [] The town info says I've got a 4" hookup, so I made an ass-umption. It will be a cleanout with the reducer below that. That way the 4" pipe will fire the stools down into the 3" bottleneck. Brilliant! Link to comment Share on other sites More sharing options...
John Kogel Posted August 19, 2016 Author Report Share Posted August 19, 2016 Fernco with the stainless sleeve is fine for joining the pipe; the steel sleeve keeps everything aligned. I'd not like reducing it, but I'd dislike digging up the entire yard even more. Whatever you do, put a cleanout that stubs above grade upstream of the reduction. Jim Lutrall....inspector57 Posted - 08/08/2016 : 8:18:00 PMIf you reduce it, be sure to leave it open since that is where it will clog. Thanks to y'all, I went ahead and reduced the pipe size, but included a cleanout.My buddy the muni inspector says, "good, you can fill it all back in. It was good that you put in that cleanout." The black pipe turns out to be a kind of flexible poly, like black poly water pipe, not brittle like PVC. I used the PVC primer and glue on it, and it is water tight. Anyway, I am firing guns in the air in unbridled celebration. Thanks agin. [:-party] Click to Enlarge 98.87 KB Click to Enlarge 114.41 KB Click to Enlarge 133.5 KB Link to comment Share on other sites More sharing options...
plummen Posted August 21, 2016 Report Share Posted August 21, 2016 Around here thats considered "funneling",A big no go. Anyway I would have installed the cleanout in the 4" instead of the wye. Link to comment Share on other sites More sharing options...
John Kogel Posted August 21, 2016 Author Report Share Posted August 21, 2016 Around here thats considered "funneling",A big no go. Anyway I would have installed the cleanout in the 4" instead of the wye. Thanks. I am prepared to dig up the 3" lower section and replace it if it comes to that, but got the green light for now, which means I can move forward. Got the roof to put on and siding to paint before October. I have a cleanout where the main pipe comes out from under the slab of the new addition, and two cleanouts on 2" drain lines inside. Compared to some of the septic systems I have lived with, this connection to city sewer turns out to be pretty simple. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now