I always have questions that don't seem to be addressed in installation manuals. I'm installing the catch can kit from Needswings...

1. The brass drain plug that goes on the underside of the catch can doesn't appear to thread all the way into the can itself. Please see picture. About 1/4 of the threads are still showing. Is this normal? I can't screw it down any tighter.

2. Rob explains that the passenger side of the y coupler that goes into the throttle body needs to be plugged off. Why is this?

Thanks for the help.