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I just received a Mag 12 that I plan on using in conjuction with a w/d. Is there an easy way to go from 3/4 MPT to a 1 1/2 return line besides a bunch of PVC collars? Probably a stupid question, I just hate plumbing. Thanks
 

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I usually use this site just to see what my options are since its a pretty comprehensive list

http://www.plumbingsupply.com/pvc.html

I think your options are a threaded bushing or union, but I think you will need two stages to make the jump from 3/4 to 1 1/2

The problem may be finding the part you want at your local store.
 

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I'd need more specifics about what you're 1.5" return line consists of, but there should be a single solution assuming it's just pvs.

Check this out: http://www.fishsupply.com/supplies-plum ... shing.html

They have slip x slip, thread x thread and slip x thread.

One of these should work unless your return line is standard 1.5" clear tubing.
 

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I was able to find a 3/4" FPT x 1.5" slip at the local Menard's. Might also want to check out a Lowe's if you have one - they seem to have the most PVC fittings out of any local store I have found. Hopefully that helps.

Mike
 

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On a practical side, I would make the change from 3/4 to the 1.5 as close to the return as you can. I'm no physicist or expert on fluid dynamics, but if you double the size of pipe, you are going to be tryng to push about 4x the weight of water up that pipe back to your tank. It will result in head loss, making your pump a lot less efficient.

The straighter the line the better, too.
 

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Danner actually recommneds 1.5" as the MINIMUM inside diameter for use with their pumps.

http://167.206.26.171/instructionsheets/ZG100.PDF

The 1.5" plumbing would provide less friction for the pump to force the water through so all the pump has to do is lift the water rather than have to force it through smaller diamter plumbing.
 

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1.5" is quite a large return line on an aquarium. I usually use a 3/4" to 1" hose barb adapter. Run 1" clear vinyl to another 1" hose barb that is connected to a bulkhead (if the tank is drilled) or to rigid pvc return line(s). If your bulkhead is 1.5", you can reduce to 1" with a male adapter and slip x threaded reducer. But, the key is to use the vinyl hosing between the return pump and the tank, otherwise you get a humming noise. It's easier if pictures are involved. What size is the tank? Is it drilled or are you using an external overflow?
 
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