Are you talking exterior overflow? I have a dual drain box that is exterior box size of 10Lx4wx9 1/2"tall. It has two drains of 1 1/4" each. One drain is currently capped off, and the other has a 1 1/4" new braided flexible PVC drain line coming off it about 4 feet long or so, that can be cut down if needed. Interior box is black and is 9x3". Has a u-tube for overflow siphon. The exterior box has a durso on the drain line to keep it quiet. PM me if interested.