I believe most (if not all) of mine are also the red ones. I usually keep a few extras in the toolbox because they do wear out and leak air.
Drives me bonkers when I'm working on something and there's an air leak near by.
Don't really have any advise as both the male and female ends I've had wear out. Brass or steel, didn't seem to matter. Did pick up a couple Prevost female ends off the MAC truck, they are quite nice and a few around the shop are 5+ years old.
http://www.amazon.com/Prevost-PVOIRC061201-Regular...
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'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold
![waah](http://67-72chevytrucks.com/vboard/images/smilies/waah.gif)
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I'm kinda like duct tape- no real purpose, but handy to have around.