Joined: May 2009
Posts: 1,208
Likes: 2
From: Whitestown, IN
Bikes: Fisher Opie freeride/urban assault MTB, Redline Monocog 29er MTB, Serrota T-Max Commuter, Klein Rascal SS, Salsa Campion Road bike, Pake Rum Runner FG/SS Road bike, Cannondale Synapse Road bike, Santana Arriva Road Tandem, and others....
How long the pressure will hold depends on the quality of the inflator, but yes that cylinder is toast. You should carry two new cylinders and only puncture them when they are needed.