My DIY PVC OVERFLOW TUBEI couldn't find any more used overlows for my tanks so after Googling DIY overflow, this is what I ended up making.I used PVC schedule 40,one inch diameter, nine 90° elbows, one "T", one 1"connector, and a 1 1/4" conector that I slotted and screened. I also used an airline valve to insert in a drilled hole in the top "U" going over the tank top.
*****I have revised the inlet piece to the ABS style described near the bottom of the page for the second unit I built. I found the flow wasn't up to what I needed so I "lowered" the "T" section. The greater the distance between the top where the water overflows into the unit, and the "T" where the water flows out, the greater the flow out of the tank.
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FULL SHOT PICTURE
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Upper View
This picture below shows the part that goes into the tank, in the front of the picture.
These are some pics taken after installation. One is a full view of a 20g with 10g sump (too small for seahorses) and the others are closer up pics of the "U" tubes, overflow, and bleed valve/air vent tube. The black painted ones are for my seahorse tanks.
I've made up many more and while they're basically the same, I've changed the actual overflow inlet and painted it with black laquer. Instead of the PVC 1 1/4" connector cut for screen, I used an ABS 1 1/2" to 1 1/4" reducer in the small end of an ABS 1 1/2" to 3" section that I cut and screened.
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