Want to drain through the very bottom of your barrel? Order this group of parts: bulk head fitting, elbow, adapter and full flow shut off valve.
Drill a 1.5" diameter hole. Insert bolt/body with washer through the hole. Screw on nut to secure unit in place. Wrap all male threads with Teflon tape. Screw Elbow into bulkhead fitting. Now screw fine threads of the adapter inside of elbow. Attach the Full-Flow garden hose shut off valve to the adapter. Make sure the shut off valve is in the OFF position before filling your container.