Product review (4 stars): the hanging loop is not sturdy on purpose)
Takes a bit to figure out which way it fits together but works as expected.  The housing can be flipped around to be it a right or left handed exhaust and the back flow valve (little red rubber flap) and be switched too (you'll want to make sure it is hanging down however you have the pump installed, be gentle with it though, the hanging loop is not sturdy on purpose).