If your boat or jet ski has this type of drain fitting that is a plastic thumb screw, this may be the adapter you need. You will on receive the adapter only. Your o-ring will fit on it and our light screws into the female end. Simply just adapts your thread to our thread. Can be used with all of our drain plug lights (except of course our rubber expanding plug)
NOTE: Although described as Yamaha, seadoo etc.. Look at the pictures provided and make certain by comparing yours, yamaha boats have at least 4 different types of drain plugs that we are aware of.
WE HAVE SEVERAL DIFFERENT TYPE OF DRAIN FITTING ADAPTERS. CHECK THE OTHERS OUT IF THIS ONE ISN'T IT.