3" to 4" conversion

LoTwan

I am trying to find out if there is something on the market that will allow me to join a 3" pipe to a 4" pipe. Can anyone help?

Billy Bunting

Pipe for what ???

gdavis

not being funny but u cant go wrong with a 4x3 reducer!

LoTwan

I am connecting 3" down pipe to 4" sewer pipe to carry rainwater.

gdavis... thanks for the term I figured if I had thought of something someone else had already made it... I just didn't know what to call it.

Joey the lips

Hold fire there a minute unless it was presiously connected its against planning regulations to connect rain water to a sewer. Unless the law has changed recently.

LoTwan

I am not running rain water into a sewer, I am running it into 4" pipe which is running into my brand new rain water collection tank. I don't think my engineer or my groundworks guy would let me run extra water into my INCREDIBLY expensive polishing filter... and I know I wouldn't let myself

I shouldn't have used the word sewer above but I was describing what the types of pipe were.

Micky Dolenz

Pedantic, but it's called soil pipe when over ground and sewer under ground.

It may be hard enough to locate a 4 to 3 reducer. Most if not all plumbing stores will not stock them as there is no call for them.

You may have to use a 4 inch rubber bung and widening the 2 inch hole to accommodate a 3 inch pipe.

gdavis

will a 4 inch fernco make a seal on 3 inch?

LoTwan

Micky... I guess I was right calling it sewer then as it is going under the ground

Joey the lips

LoTwan wrote: »

Micky... I guess I was right calling it sewer then as it is going under the ground

No, not strictly speaking there is rain water waste and sewer waste. Rain water runs away into ditches etc sewer must be treated. You cannot run the rain water into the sewer because you overload it. This was all i was saying.

The difference is the pipe colour. Sewer is orange pipe. Soil is black. Sewer is thinner pipe soil is thicker and generally contains a UV blocker.

Years ago there was a theory that sewer pipe contains a pigment that stops rats eating through it...I never believed this as most pipes were clay when i was younger.

Micky Dolenz

gdavis wrote: »

will a 4 inch fernco make a seal on 3 inch?

I don't think so. Might not get the best seal.

If the bung was used it would have to be used on the vertical drop, would not trust it for a horizontal run.

This is interesting but pipes may need sweating and plenty of glue to get a tight fit.

LoTwan

OK, let's call it 4" pipe :-):-)

DPL told me that there was no such thing as a 4x3 reducer (even though I had seen them online after it was named here. Heiton Buckley building section said "never heard of it but let me put you through to the plumbing section, they might know of something". Plumbing section said "I don't have a reducer but let me see if I have something, can I put you on hold? <pause> I have a Fernco 4" to 3" joiner. That will do the job for you". Fair play to HB

I have just read want Micky had to say and it is my understanding that gdavis was suggesting using a 4" -> 4" fernco and trying to get it to fit the 3" pipe. Would you still not trust the fernco on the horizontal if it were a 4" -> 3"?

It can be set up either way, with the junction on the vertical (before the downpipe hits ground level) or on the horizontal (when it is below the finished concrete level). I am more inclined to have the junction above the ground so that I can see if there is an issue with it rather than having it buried under concrete.

Micky Dolenz

LoTwan wrote: »

OK, let's call it 4" pipe :-):-)

DPL told me that there was no such thing as a 4x3 reducer (even though I had seen them online after it was named here. Heiton Buckley building section said "never heard of it but let me put you through to the plumbing section, they might know of something". Plumbing section said "I don't have a reducer but let me see if I have something, can I put you on hold? <pause> I have a Fernco 4" to 3" joiner. That will do the job for you". Fair play to HB

I have just read want Micky had to say and it is my understanding that gdavis was suggesting using a 4" -> 4" fernco and trying to get it to fit the 3" pipe. Would you still not trust the fernco on the horizontal if it were a 4" -> 3"?

It can be set up either way, with the junction on the vertical (before the downpipe hits ground level) or on the horizontal (when it is below the finished concrete level). I am more inclined to have the junction above the ground so that I can see if there is an issue with it rather than having it buried under concrete.

A 4 x 3 would be ok on the horizontal as they would more or less a snug fit. I wouldn't trust it under concrete though, the rubber and steel jubilee clips may not wear well over time in such an environment.

LoTwan

To be honest I don't really want to run 3" downpipe under concrete either so I think I will stick with the joiners on the vertical above ground

Thanks guys. You all rock!