When do I use a 90 short elbow vs. a 90 sweep elbow?
A 90 short elbow (also called a 90 adapter elbow) is designed to use at each inlet valve location. The tight 90 acts as a trap for debris that might be too large to pass completely through the tube system. For example, if you vacuumed up a small toy or even a comb, it would most likely get caught in the adapter elbow, preventing the system from a potential clog.
