Tri Clamp wyes offer an evenly divided bi-directional splitter, or dual flow combiner.
U-bends
Tri Clamp U-Bends offer a smooth turning radius that minimizes fluid friction where an air lock may be needed, or a more creative use has seen inverted as air vents with perf screens, similar to the way electric lines run up into a u-bend on the outside of a building.
Ryan Mabbutt
Edward Barcenas