In article , Don Foreman says...

Put a ball valve upstream of each quick-disconnect fitting. Those
fittings all leak a little after a while, but good ball valves are
surprisingly leak-free.

*Especially* if the QC fitting is at the bottom of a drop.
I've had a lot of trouble because crud falls down to the
bottom of the drops and jams the seats in the regulators.
I've learned to put a drip leg on vertical drops, with
a drain valve.

Jim


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