These gasket kits need a better description. I went to the McFarlane website to try and decide which kit was best for my Aztec. I picked FSP-KT2 thinking that the top o-ring was better that the cork gasket. The o-ring was way too bit. I have since revisited the McFarlane website and you can hit a menu to determine which kit is right for your plane. If you have an older style Piper fuel strainer, I would pick the FSP-KT1 kit as it looks like that type has the proper type gasket that goes between the bowl and the top inlet piece. The bottom rubber washer worked great. Aircraft Spruce = more info needed to help the consumer determine which kit is right for your customers.