I have a Trigger Systems Emerald 39 sump that I bought new about a year and a half ago. I used it for 8 months on my tank but realized it was too small. I made some slight modifications to allow for an auto top off and dosing. There is a 1/4" hole drilled in the rear of the sump in the middle chamber that supports an RODI adjustable float valve. This can be covered up with a piece of acrylic or used as I did for auto top off. I will give you a float valve with the sump. I drilled a few new holes in the top rim on the back of the sump to allow for Murlock push fitting bulkheads for dosing. I put one on so you can see what it looks like.
It's in great working shape with absolutely no leaks. If interested or want more info feel free to message here or send me a PM.
New these sumps are $525.
I'll let it go for $250
https://www.bulkreefsupply.com/emera...r-systems.html