Banded Clamp

[gsici]

I am tapping into my main indoor drain for a basement toilet. And I could use to banded clamps, however my preference would be to use a regular coupler on one side and a rubber on the other but getting the gap to zero is vituallly impossible. How big a gap is allowed when using a 4" banded clamp?

[Terry]

You normally add 1/4" for the band.

If the fitting is 9-3/4", you cut out 10"

[gsici]

Terry Sorry I am a newbie.
Not sure I follow. I have a 4x4x3 Wye fitting going into this gap and I would like to glue one side in and align the other side as close as possible to the pipe using a clamp, however during my dry fit I cannot get one side in to glue without at least a 1/2 '' gap. Is this too big?

[Guest]

I don't think you can glue one side and make it work.
When I"m cutting in a wye, or any fitting for that matter, into a "fixed in place" line, I use two couplings.

[hj]

Unless one side or the other is able to be flexed out of the way, there is no way you will install your Y by gluing one side and then a conventional band on the other.

[gsici]

HJ
Thx I will do two clamps, However here is a twist. I am reducing from a 4"PVC to a 3"ABS at the WYE and I am less comfortable (after the numerous threads on this forum) about using transition glue. Would a third clamp be okay?