[LQT]

I’ve observed the same issue. It seems that down from the smallest Reefer tank, the Nano, to their largest offering, the 750xxl, they seem to all have the exact same size overflow box, drain plumbing and return plumbing. Seems terribly limiting as you get to the larger models and kinda throws their flow recommendations out the window as you get into the larger tanks. These are the specs of the plumbing for all of the RedSea Reefers, regardless of tank volume from BRS.

Return Plumbing - 25mm
Main Drain - 32mm
Emergency Drain - 25mm