Pro tip: A small leak on a valve manifold in Galveston cost me three hours
It was just a tiny drip from a fitting I'd already checked twice. The issue ended up being a hairline crack in the brass body itself, not the seal. Anyone else had a fitting pass a visual but fail under pressure?
Ugh, that's the worst. It's always the part you don't think to check. I've had that happen with old compression fittings that looked fine, but the ferrule had a tiny split you couldn't see until it was apart. Pressure finds the weakness every time. Makes you want to just replace anything over five years old on principle.