HOB overflow box

This is still a work in progress

Please let me know your thoughts, concerns, or questions!

This is a Hang on the back overflow box for a fish tank, it allows water to be siphoned down to a sump for filtration without needing to drill the tank. The design resembles closely to the cpr overflow box using a built in U tube design. To start the siphon take a airline tube and put it into the u tube section at the top, then suck in air while the overflow box is filling up. Once you get water starting to come through the airline tube, stop sucking and remove the airline tubing.

The holes in the external box should be large enough to add 1 in bulkheads and then your own 1 in pvc

The lids are optional, especially the internal overflow box lid, its simply to keep algae from growing inside of the box.

Let me know what you think or if I missed mentioning any important information!