One way conveyor and conveyor block with 2 opening.
I found it a lot of times that a full conveyor sorter is not needed. Crossing them on top of each other in a pressurized room when they are in a wall can only be done with a sorter because i don't want to connect the two conveyor line, The single block does it so a pipe that can be pressurized would be perfect. Similar to the block conveyor but with only 2 intake.
Also a conveyor block that is one way only like the sorter, but without any of the sorter stuff. Just a one way pipe.
It could save pcu and also better for the server.