Ratty

Hi All I just by chance got a cermaic chip forge from the local blacksmiths yesterday that he had running on Natural gas. I want to convert it to LPG but I dont know what adapter I would need to do that. The forge gas hose has a cooker type connecter and I want to connect it to a standard size propane hose. But I have no idea of what the adapter is called so hopless searching the internet. Thanks!