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Old 11-21-2013, 01:09 PM   #1
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pvc overflow problem

I built a diy pvc overflow for my frag tank and have a hard time getting the siphon to start draining or keep.draining. Its very sparatic

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Old 11-21-2013, 02:47 PM   #2
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Could you take a picture of the other side? From here it doesn't look like you should have a problem
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Old 11-21-2013, 03:25 PM   #3
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Not the beat pictures, but all i have untill i get back to the tank

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Old 11-21-2013, 03:38 PM   #4
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From the pics, it looks like the hole where the airline tube is isn't sealed. If there's air escaping in through there, you'll never have a siphon. It needs to be siliconed.
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Old 11-21-2013, 03:40 PM   #5
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Looking again, is there a hole drilled on that end cap on the taller tube outside the tank? If not, there needs to be one for air to escape. Even if you silicone the tube, that will impact the siphon as well.
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Old 11-21-2013, 03:49 PM   #6
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There is a hole on the end cap.now,
I was told not to silicone down the airline incase i needed to move it up or down.the back side of the overflow
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Old 11-21-2013, 04:13 PM   #7
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Actually what you need to do is glue an airline check valve(walmart or any lfs should have these) in the hole where the airline tube is. This will prevent air from being sucked into that U tube section. Then attach the airline to the check valve so you can pull the air out to start the siphon. Make sure you have the check valve in the right direction.
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Old 11-21-2013, 04:48 PM   #8
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The airline already has a check valve on the end already. Do i.need to.silicone the airline hose around the pvc
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Old 11-21-2013, 05:00 PM   #9
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You want the check valve glued directly to the PVC. You don't want any air gaps in that U tube going over the lip of the tank. Air in there breaks the siphon.

Edit: basically you want the whole thing to be air tight from the inlet to the T where the vertical air gap pipe with end cap is. That whole section needs to be air tight.
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Old 11-21-2013, 05:22 PM   #10
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Ok, so slide the airline all.the way down a.d superglue the check valve to the pvc.
Or silicone the check valve to the airling and leave airline still extended but silicone around the hole in the pvc so i dont have to bang my head on.the wall to suck on the check valve.

Will having it not cemented together cause the same issue
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