The new tanks won't spit out propane without something connected to it. There is a spring loaded valve that gets pushed in. You can manually do it with a screwdriver.
From
http://www.nashwauk.net/UnderstandingOPDValves.htmlThe Discharge Check Valve, prevents any discharge from the cylinder unless there is a POL fitting connected to the valve. This feature has been discussed as being a suspect problem on web site information pages dealing with poor flow/discharge from cylinder. www.bluerino.com/
My test of this feature was to run a turkey cooker burner at full regulated flow and loosen the POL fitting until there was a decrease in flow. I was able to back the POL swivel nut away from the valve 2 full turns before the flow began to diminish. This was done with a POL fitting that has an O-ring seal, and there was no noticeable vapor leak while loosening the swivel nut.
I then reversed this test by opening the cylinder hand wheel and then tightening the POL fitting. The vapor flow started and was flowing sufficiently with more than 1-1/2 turns away from full engagement.
With this finding I find no merit in the information on BlueRino web site.