25mm x 1" fitting

[Awesome Opossum]

I can find 25mm x 3/4" easy. This is for my return line on my 180g. I do not want to choke it down even further. Does anyone know where to find a 25mm×1" pvc fitting? Even better if it's sch 80 and a slip×slip union. Thanks yall.

 

[painter1982]

You need an adapter to go from metric to imperial. Bulk Reef Supply should have what you need. 25mm usually adapts to 3/4”, and 32mm adapts to 1”

 

[UncommonSense]

I do not want to choke it down even further.

Fun fact? Imperial plumbing is measured by ID, metric plumbing is measured by OD!

So, 25mm is actually technically <=3/4” sch.40!

 

[painter1982]

I do not want to choke it down even further.

Fun fact? Imperial plumbing is measured by ID, metric plumbing is measured by OD!

So, 25mm is actually technically <=3/4” sch.40!

schedule 40 3/4” PVC has an outside diameter of 26.7mm. How will that work without the adapter?

 

[Awesome Opossum]

I think that makes sense. Originally I thought the return was 3/4" but read 25mm and that translated to just under 1".

Fun fact? Imperial plumbing is measured by ID, metric plumbing is measured by OD!

So, 25mm is actually technically <=3/4” sch.40!

To clarify, the 25mm×3/4" is what I need? Do they make a larger adapter? I was hoping to run 1" as far as I could on my return line. I know I could use another reducer but I would love to minimize the fittings.

 

[UncommonSense]

schedule 40 3/4” PVC has an outside diameter of 26.7mm. How will that work without the adapter?

Oh, I’m saying that 3/4” schedule 40 PVC pipe has an inside diameter very similar to 25mm metric pipe, thus flow restriction from an adapter would be somewhat negligible!

To clarify, the 25mm×3/4" is what I need?

That will adapt you from metric to imperial with negligible restriction, yes!

Do they make a larger adapter? I was hoping to run 1" as far as I could on my return line. I know I could use another reducer but I would love to minimize the fittings.

I’m sure one exists if you scour deep enough into the bowels of the internet; alibaba, maybe an odd Amazon seller… my cursory search didn’t pull up any promising options!

If I had to guess, this is an unusual application from a residential or commercial plumbing perspective, given that you’re trying to both reduce in diameter, and adapt from metric to imperial in one part! — multi-function fittings exist within metric, and within imperial; but reducing and adapting in one isn’t a common need!

What I would do is: run 1” as far as possible to reduce frictional flow loss from what is likely an oversized pump, then adapt to 32mm metric, and reduce to 25mm! (You can then ideally manifold off the 1” segment for any equipment so the extra diameter gets fully utilized!)

 

[UncommonSense]

As an aside, given that 25mm/ 3/4” pipe is only capable of around 750gph (4ish turnovers per-hour) :

Would it be possible to plumb the return pipe up behind the tank to return over the rim? — this would allow you to plumb it in 1”-1.25” the entire way!

 

[Awesome Opossum]

I havent though about that. Not sure how that would work with my screen top I will be making. I have considered having someone drill an additional return hole buy not sure what that would cost.

 

[UncommonSense]

I havent though about that. Not sure how that would work with my screen top I will be making. I have considered having someone drill an additional return hole buy not sure what that would cost.

Drilling isn’t terribly hard! — I’d be happy to help if I was in your area!

Regarding a screen top, what about putting the returns right in the rear corners, where you can make three 90 degree bends or two 45 degree bends around each pipe with the screen framing?

 

[Awesome Opossum]

Im having a hard time visualizing that. What i could see working is abandoning the return line and running a new one up the back side of the stand/tank and to the overflow and reuse the outlets at the overflows. I dont think id be happy looking at the pipes though. I could also run two return pipes. One would be new like described and then the og line. I just dont think I will be happy with esthetics

 

[Dorsetsteve]

Use a 25-32mm plain glue bush, then a 32-1” plain glue to threaded.

 

[Awesome Opossum]

Thank you!!!!!!

Use a 25-32mm plain glue bush, then a 32-1” plain glue to threaded.

that's what I want