DIY overflow kit question

[afamousjohnson]

So got these pieces to make an overflow for the new tank. Remembered on my 90g that the mega flow overflow had holes drilled in it where my finger is in pic on drain. Do I need to drill these? Imagine it's an air stop/break? Who knows this

Also guess I just need to get straight 1" and 3/4" schedule 40 and put it all together? See anything I may be missing?

 

[afamousjohnson]

Any of you guys/gals know the answer to this? #reefsquad

 

[redfishbluefish]

That piece you are pointing to appears to be the top end of a durso standpipe. If so, the only hole that is necessary is in the top of that endcap. Where the arrow is pointing in this picture:

 

[kschweer]

I agree with the post above. On a durso the only hope needed is the one on the top cap. The ones that come with the marineland tanks are not standard dursos. Like personally like the standard durso over what marineland gives you.

 

[afamousjohnson]

Oh cool - thanks u 2. Ya I have the hole in the top for air to escape. Was just wondering about those side holes they have in the mega overflow kits. Not impressed with this one - durso stands pretty high - but it was supplied on store credit which is better than me having to spend cash.lol just had to trade a coral

 

[afamousjohnson]

That piece you are pointing to appears to be the top end of a durso standpipe. If so, the only hole that is necessary is in the top of that endcap. Where the arrow is pointing in this picture:

Did u opt out having the strainer at the drain entrance? Mine will look like yours

 

[kschweer]

To lower things you can cut the piece of pipe between the cap and the t. It really only needs to be there to hold the 2 together. A piece of pipe about an inch long should be plenty and the two will be right up against each other. Hope that makes sense.

 

[kschweer]

Also just noticed that more than likely the durso parts will be 1 1/2" and your bulkhead is 1". This is normally how it's done. You will need to reduce the 1 1/2" to 1" to make it into the bulkhead. I usually use an 1 1/2" coupling with an 1 1/2" to 1" reducer bushing and a small piece of 1" pipe.

 

[afamousjohnson]

It came with a reducer it looks like so good there - fits right into 1" bulk head.

 

[redfishbluefish]

Did u opt out having the strainer at the drain entrance? Mine will look like yours

First off, that picture isn't "mine".....it's a stock picture off the internet. I no longer use conventional overflows with durso's. I've gone Glass-Holes because I didn't want that behemoth overflow taking up valuable tank volume. But when I did have a durso, I did not have a strainer on the elbow.

 

[afamousjohnson]

Gotcha - glass hole - definitely way to go

 

[maroun.c]

The hole on the first picture is an anti Drain hole which will allow air to be sucked and kill the syphon before the water level reaches to the lower part of the screen on the picture. USefull to minimize volume of water that syphons when pump is off especially if you have a small sump that can't handle the amount of water.
The Durso hole on the top is different it helps push the air out when the drain starts and avoids having an air pocket. it also can control the amount of water drained by allowing more or less air in. Bigger hole more air so less water or slower drain (against what most people think that the bigger the hole the faster the drain)
Some will start with a small hole and make it bigger gradually till they reach a perfect drain balance (speed and noise) some will insert an air tube in the hole with a lock to control the air.
I'm fine with the durso holes as if they're blocked by something the drain turns into a syphon and sucks at max speed so no risk for flood. whereas anti syphon holes can be blocked by a snail or dirt... and then the syphon goes on and can cause a flood.