Line your Flanges (673-104HC) up on the wood piece and mark the screw holes.
Pre-drill the holes. You want to do this to make sure the wood does not crack when installing the Flanges (672-103HC).
Place your Flanges (673-104HC) back onto the wood piece and install them using wood screws.
Once Flanges (673-104HC) are installed place a 48” pipe into each Flange (673-104HC) and tighten the set screws.
Take your 72” pipe and attached a Side Outlet Tee (671-604HC) to each side of pipe. Make sure they are pointed in the same direction while also making sure the vertical holes are not being blocked then tighten set screws.
Slide a 12” pipe into the open horizontal hole of the Single Socket Tees (670-104HC) and finish the open 12” pipe off with a Single Socket Tee (670-104HC). Make sure the through hole of the Single Socket Tee (670-104HC) is pointed vertically then tighten set screws.
Once built, slide the fittings up and onto the 48” pipes. Adjust to desired height then tighten set screws.
Cap the 48” pipes off with Flanges (673-104HC) and tighten set screws.