This sale is for a (1) brand new chrome gas cap that was the most common size used by a multitude of boat manufactures back in the 70's and 80's. If your fuel flange looks like the one pictured then the odds are good that this is the cap you need. This sale is for the cap only and not for the whole fill assembly. Cap includes chain and oring seal. The cap is approximately 1-5/8" OD across the outer top and 1-3/8" OD across the threads.
NOTE: WILL NOT REPLACE BLACK PLASTIC PERKO BRAND CAPS