Help selecting the correct return line bulkhead.

[TatorTaco]

I'm drilling a 75-gallon tank for an Eshopps Eclipse M overflow and return line, but I'm unsure which return bulkhead (along with other necessary parts like a diamond bit) to purchase.

Between a Bulkhead ABS Thread x Thread and a Bulkhead ABS Slip x Slip, which would be the better choice? Also, is a 3/4" bulkhead the right size for this return line setup?

Are there any key factors I should consider when deciding? My plan is to run about 24 inches of vinyl tubing from my return pump's output, which will then connect to 3/4" PVC running up the back to the return bulkhead. I'm open to suggestions here.

I’m keeping it simple - no Loc-Line or RFGs - just a basic PVC setup with a possible flanged end, similar to what you’d find on Innovative Marine or Red Sea tanks.

 

[Peace River]

While a Eshopps M meets the specs, I upgraded to an L for my 75. Good luck with whatever you choose!

 

[mboley]

I still like the numerous options available using a pvc manifold with LocLine nozzles and ball valves over the tank edge. I have three outlets barely below the water line so they're hardly visable. With the use of a DC return pump, the ball valves, nozzle choices, and one MP10 on a 50 gallon I can dial in my flow l with just one pump in the tank. My goal was minimal equipment showing in the display.

 

[TatorTaco]

While a Eshopps M meets the specs, I upgraded to an L for my 75. Good luck with whatever you choose!

Any reason for the upgrade? I don’t care one way or another for the 3rd bulkhead, and I understood that last couple years that Bulk Reef Supply was saying you only needed 2 - 5 times the turnover in your sump. This will be a low flow tank anyway.

 

[Peace River]

IMO the Bean animal approach is a significant upgrade over the Herbie approach. Additionally, while you may not need more flow now, you may reconfigure your tank and want more flow in the future. You can always run lower flow, but you can’t always run higher flow if your overflow doesn’t have the capacity.

 

[TatorTaco]

I still like the numerous options available using a pvc manifold with LocLine nozzles and ball valves over the tank edge. I have three outlets barely below the water line so they're hardly visable. With the use of a DC return pump, the ball valves, nozzle choices, and one MP10 on a 50 gallon I can dial in my flow l with just one pump in the tank. My goal was minimal equipment showing in the display.

This tank will be an upgrade from an AIO tank. I’d prefer as few items as possible “on top” of the tank or obstructing a lid as possible. I can see the allure of your setup though.

Do you have to worry about accidentally bumping the return pipe hanging on to the rim of the tank?

 

[mboley]

This tank will be an upgrade from an AIO tank. I’d prefer as few items as possible “on top” of the tank or obstructing a lid as possible. I can see the allure of your setup though.

Do you have to worry about accidentally bumping the return pipe hanging on to the rim of the tank?

No, the pvc manifold is strapped to the wall behind the tank. LocLine nozzles reach out over the tank edge. Also have an easily removable wood rim, 5" tall that's hides everything and eliminates light spill-over. My screen/ lid is recessed on the top of the wood rim.