After a diy design for overflow box, or site
I am planning my 4x2x2, I am getting it drilled for standpipe and returns. I am after a DIY design for the overflow box with parts fairly easily found. Alternatively a sound Australian site the sells them at reasonable cost.
I have done my searching but to be honest I don't know if it is called an overflow box or weir or something else
any help would be great