BBQ: Add Propane Connection with Y Connector
Propane and Butane bottles at least here (Italy) have the exact same bolt-type connector or the vendor-specific 'fast' connector. I suggest you to buy an adjustable regulator :
so you can increase or decrease gas pressure upon your needs.
To see if pressure is correct just look at the flame, it has to be blue without orange tips, if you see most flames turning orange you have to decrease the pressure if flames are 'sad' you can pump it little up.