Nylon screen secured with barrels own clamp, keeping bugs and debris out of the barrel The overflow hole makes a convenient place to secure the downspout with bungees.
A close up view of one the "chain links" This barrel is full, no leaks!
Barrel 2: The left hand link goes to Barrel 1, the right hand link goes to Barrel 3.
This is the "bulkhead": Gasket from made from rubber packing: Cut small whole and then cut a "X" for a tight fit over the threaded male conduit part. The gasket and male thread and placed inside barrel, and then pushed out a ~7/8" hole. When enough of the male conduit fitting is visible on the outside of the barrel to thread on the female part hand tighten, then finish with two wrenches.
