Many sellers don’t recommend it, but you can refill a 1-pound propane tank at home or even during your road trip. You just need to hook up the dedicated refill adapter on the large tank, then: Screw on the small propane tank Turn on the gas flow valve from the supply (large tank) Wait until the small tank refills. You can listen until the “hissing” stops Once the tank gets enough air, turn off the valve from the supply tank Finally, disconnect the tanks from the refill adapter