Wow, that was fast! They told me at the post office it would take until the end of hte week. Glad you got it. The overflow box is left over from my Por-clear 150 sump. I did not need the external overflow as I bought a reef ready tank. I misplaced the directions...probably right into the garbage at one point...and there is little info on the web about this company. No website that I can find. Herre is the phone number...Pro Clear Aquatic Systems 904-448-6800. They are from Jacksonville, FL. They build a very good sump, just wish they offered better on-line support. Maybe if you called them they could email you some directions.
Basically, I sent the inner overflow box, u-tube, the outter box with plumbing fixture and the over-the-back return spout. Good Luck...Lando