Price includes all the fittings necessary to join three RainBox units together, plus the overflow elbow and a 4'long overflow pipe. More details and an exploded view shown in this 1.2MB .pdf All the "overflow ports" are molded closed. You will need a 1.75" hole saw drill bit, to 'open' them. Downspout can be placed at the top of any of three barrels. It is recommended that the downspout be placed at the end furthest from the overflow port. Please call or email for shipping costs! Our shipping calculator will not likely give you an accurate price :-(