[77newell]

For #2 or similar, I carry a short piece os the small tubing that is folded over on one and secured with wire. If a leak develops in an air bag, since I use push on connectors, I release the line that is leaking and plug in the short piece. I also Carry a double ended push on in case I want to block a line somewhere in the middle.

While ferrule connections are less likely to leak, I like the ease of quick connection that push ons allow.