same purpose with YR-202.
Unlike YR-202, it has valves for each rows which allows machine keep operation even if one row is out of order.
After finishing the roll build, worker can replace the tube with ease.

caution
Air entry and air exit are separated.
Some dust or litter can stuck inside valve and can cause leakage of air.
To remove, simply load/unload air 2~3 times to blow the things out.