Lowest Price for 789 Female Thread Union to Morocco Manufacturer
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Here I fill a 1lb “Colelman” propane cylinder using a 20lb source tank with a brass adapter. All components are at room temperature. This normally only fills the small tank about 1/3 to 1/2 full because of all the air in the tank. Using a curved needle-nose pliers (or a hemostat) you can pull up on the little pin in the tanks pressure relief valve to vent the air at its top. In this way you can fill the tank all the way, stopping when you see a white freezing gas blast out – this is propane which now at the top of the small tank.
Note: since propane is a cryogenic liquid, you have to set the whole thing on its side with the smaller tank down, or better yet, set the large tank upside down and hang the little tank downward.