CARF are slowly moving away from the original Dubro bung based fuel tank stopper. In thousands of flights these have never let me down, but they did require assembling carefully and some people didn’t like them.
The new system is two part, feed and overflow both with a quick connect outlet for 6mm hard Poly tube. Inside the feed is a barb fitting to accept Tygon (or your choice of something else)
The hole accepts most popular pick ups.
