Install at the end of a 1 3/4" metal pipe of desired length about 16-18 inches into a hole made with a post digger, secure it vertically with concrete, then attach a lateral pipe long enough to reach over water using this elbow. You can then loosen the bottom portion to swing the arm to shore as needed to service your Super Feeder. The lateral arm will fasten to the feeder's pivot mount shown slipped over the end of the pipe.

Details on how to use the elbow and end cap:

http://www.super-feed.com/swivelpipemounts.htm