I have two overflow boxes with stockman mods that can handle 600 gph each with no mod, about 400 gph each with the mod, but a little less flow for complete silence is a pretty good trade off. They appear to be eschopps overflows, and only require 4 1/4" of space behind the tank. They retail new for $60, and before I ship to you I will clean the overflow thoroughly. I would like to get $40 shipped each, or $75 shipped for both. Shipping costs me $10 for each one, so it is really $30 each, $55 for both. Without the mod: The mod is removable:
Overflow boxes
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