Huh. My iPad opened it up easy??
I fill lots of tanks ,,use a regular 1/2 T valve with supply line and valve on one side. then the T valve that acts as a bleeder , then the fitting going into the tank ,,it s easy to shut off supply open bleeder and bleed excess vapour out and then refill again ,for one lb bottle rigid up a valve from a small propane torch to fill them with 20 pounders upside downPut lil tanks in freezer the colder the one is ur filling the better n the tank ur tank it from should be warmer than the one ur filling...