When you buy line cover kits they are always short a straight junction or two. So you have to buy another $39 kit to get the needed junction. Or you can 3D print it. Also the junctions that came with the kit are mounted by one screw in the center. First you cannot get to that screw hole as it is behind the pipes. Secondly one screw does not do the job. Also the screws that come with the kits are too small and easily strip out! My solution is this 3D printable junction. Use a couple of stainless deck screws to mount it.
It prints with no supports but you can add them if you want.
I added an improved version that has no visible screws. You stretch it over the screws that are about 2 3/4" apart.