Charles Kenning

Derek as you probably already figured out you didn' need to worry about overy filling without the vent you only get equal pressure propane which isn't much if you have an old bbq grill cylider you can take the fitting out if it and screwup on your 100 lbs. And I'd but I've been filling propand botttles like this forever and I go until I'm getting liquid out the vent which I'm guessing is about 100% full only problem I have with that is once in awhile when I start new bottle it will freeze up my low press. reg.