Using a 13kg propane bottle

Hi all, I am looking to use the caravan( baily unicorn vigo 2) semi permanently while we have some home alterations completed, currently using a 6kg calor gas bottle which is stored in the locker feeding a 30mb regulator fitted to the caravan, I am wanting to use 13kg bottles I have two full ones,  but they have the push/clip type fitting as opposed the screw/spanner type fitting on the 6kg, does any one have any advice/information on what I need to do to convert to using the 13kg bottles for the time being