On 06/16/2013 07:44 PM, Stormin Mormon wrote:
I've got a couple part full propane tanks, and
would like to transfer some of the propane,
and take the (now) empties to fill.

Refrigeration guys used to do this with "Freon"
using a hose, and chill the destinaton bottle.
Anything like this exist for propane?

I seriously doubt it, the liability would be too high.

They do, however, sell a POL fitting that goes into the big tank (left
handed thread) and converts it to NPT (I have one on an empty bottle I
use as a portable compressed air tank). With some ingenuity, it would
not be very hard to buy two of them, and whatever other fittings you
need to do what you are setting out to do.

http://www.suremarineservice.com/20MP4POL.aspx
http://www.gashosesandregulators.com/brassfittings.html (look at part
204051)

One idea would be to connect the thing in the first link to the thing in
the second link (with a coupler, or find a POL - FPT), but you can
probably come up with something better than that.

Jon