Dave Sr. from SWISCO responded:
September 11, 2015
The 39-247 is fixed, while the 39-336 has a swivel joint. That is really the only difference, and what you use depends on what would be easier for you to work with. I don't know what setup you have so I can't really make a recommendation. The 39-336 could be easier to operate the window with the swivel if you are standing on the floor and have to reach up to the window.
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