The new cap came quicker than expected and installed and fit perfect. I was cautious about possible fuel leaking and had put an added "O" ring on the old one until this one came in the mail. Mine old one had become cross threaded and wouldn't screw all the way in. I read another review here of someone who was replacing thiers for the same reason. I wonder if that is a problem the manufacture Perko has?? Anyway, the old cap was made in 1998 so if I have to replace it every 13 years it's not a biggie.