Need a littile plumbing help.

[gaetyn]

So I am about to start plumbing my reef ready dual overflow 155 bowfront tank. Each overflow box has 2 pre drilled holes for different size bulkheads. One hole is larger than the other. My question is: Do I use the larger diameter hole for the return line and the smaller one for the drain or vise versa? I am going to use a Durso for the drains.

Thanks in advance.

 

[aquaph8]

If it were me I'd use both holes for drains and bring my returns up and over. That way you have some protection in the event of a clogged pipe. You can also make it less noisy this way.

 

[aquaph8]

Like this

http://www.reefcentral.com/forums/showthread.php?t=344892&highlight=herbie+overflow

 

[CReyes350]

In all my tanks I do the larger diameters as the drain and the smaller as the return... But its all personal preference. Good luck!

 

[AZRippster]

It really matters on how big the "big" hole is and the return rate of the pump you are intending to use. The smaller hole is typically 3/4" to 1". Almost any size pump I can imagine that would support a 155 should not require a hole bigger than that. However, a drain that is 1 1/2" (or smaller) and an Iwaki md70rlt is a bad idea! I learned this the hard way once :headwally: You can never really go too big on the drain as long as the tank structurally supports it.

 

[gaetyn]

Thanks it makes sense to go with the larger hole as the drain.