My Beta 38 WOC K35616 has a manual waste engine oil pump. The outlet of the pump has a metal cap with o-ring (photo attached). What are the threads on the cap? I would like to get a plastic thread-to-barb fitting with short hose to use in place of the cap to better direct waste oil into a container.
I suggest that you use 1/2" id hose and slide it onto the outlet tube of the pump and fit a hoseclamp to secure it.
Anything that screws into the outlet tube will have too small an inside diameter to have any flow.
Related, any thought of drilling a hole in the back of that little cap and securing it to the pump with some kind of keeper? Every time I touch the cap it is with great worry about dropping it into the bilge!