Couple of things..
Does exposed to weather just mean it can't be an inline by any chance??
The old timer's way was a dried cow hock.. Those are kind of hard to find these days..
another is to drip a bit of melted candle wax over the cap after you put it on the nipple..
I have heard of guys putting a bit of saran wrap over the nipple and then putting the cap on..
Haven't tried that one.
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