Product review (1 stars): Horrible product
Do NOT buy this product!  The plastic ends are not mounted to the aluminum tube - you are expected to thread them onto the vent tube.  As soon as you start to try screwing the plastic ends onto the aluminum vent tube, the tube starts bending and the end piece won't thread on.  After an hour or so of trying to get this product to perform as advertised, I threw the plastic ends into the trash and finally managed to get the vent tube to fit onto the ends provided with my old tube -- although it took a lot of work to get that done.
The manufacturer should re-engineer this product so that the plastic end pieces are permanently fitted to the tube at the factory.  Maybe then it will be "easy to install," as they advertise now.
If I had realized what a nightmare this thing is, I would not have bought it.  Save yourself a lot of trouble and buy another product.