To use for Normal air cleaner on PC18 and PC20.
With PC18, there is quite a bit of space between the OEMAir cleaner and the carburetor.
At that time, this funnel or joint is used to connect the OEMAir cleaner and the carburetor.
good point
You will be able to use OEMAir cleaner as it is.
It's easy to adjust with Screw.
A bad point
None
This is convenient. After all, if you care about the weather, you want to use Normal air cleaner. I recommend this to you.

