A simple 2-way PC4-M6 bowden connector. It needs two PC4-M6 bowden connectors, and a 28-19mm long bowden tube assembly. the bowden tube for smoother, but of course for bowden connectors that allow the bowden tube to pass right through, having the two ends of the bowden tubes meet directly on the inside is a better solution.

The Fusion 360 file allow you to easily make this design compatible with other kinds of bowden interfaces.