I didn't like how long my air/oil separator was, so I cut off the end to make it shorter.
Then I epoxied a new barbed outlet in a new end cap. This is the outlet where the oil will drain back into the valve cover, so I installed it low on the end cap, so it is at a lower point than the oil inlet at the other end.
Next I need to paint the new end.
Photo 2 is the oil filler cover, for the cow, being painted.
A shorter version. Outlet on left is lower than the one on the right.