NOT compatible with any other hot water bottle, If your hot water bottle is NOT Peterpan brand you will need to contact the brand/supplier of your hot water bottle to seek a replacement. | Cap and lanyard only, Please note, compatible with plastic thread hot water bottles only | Each cap carries a lanyard, A lanyard keeps your stopper within reach, Never lose your stopper again. | Materials: Polypropylene, no sealing washer to loose and cause floods. | Your Peterpan product comes with a 1-year limited warranty against manufacturing defects. your product will be replaced, at our option, should it be found defective because of faulty workmanship.