The hardware store in the Main Street, about 2 minutes walk from Conanicut Marina, is the only place we have found in 4 years of cruising on the US eastern seaboard, that has the adapter,s and is prepared to fill, European propane bottles. Too late for us, as we had already made the transition to US bottles, but possibly useful for those making a quick dash up the coast en route back to Europe and not wanting to change systems.