Ok....
A certain unamed vendor at the boat show was telling some guy about a Berkeley pump and how to seal it. I mentioned the use of marine grade silicone due to the surface of older boats not being perfect for the gasket. This "Parts guy" starts to let into me and says how easy the o-ring is to install and all. I just walked away laughing. It is obvious he was never on the working end of a transom adapter in real life.