Create cap surface between pipes

Hey,

Im currently trying to generate open pipes. So far so good, the pipes are always attached to each other.

How can i generate a cap surface between the pipes, while the pipes themselves still stay open on both ends?

Best,
strudelone

Bounding box union on all pipes.
Explode Box. Pick largest face.
Split it with pipes. Create Area Set. Cull the largest one. Add some condition for excluding border splits if needed.