Which connector?

In Southern and Eastern Africa you will have the least trouble with POL-105 connectors. Other styles (like South African Cadac) are harder to come by in some countries. We bought our Cylinder from Shell in Namibia and had it refilled for the rest of our trip.

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How long does a propane tank last?

A 12kg propane tank lasts us 2-3 months cooking breakfast and dinner every day for 2 people. This results in relatively few fill-ups during a 1 year trip. Filling up is usually done in large cities.