Thanks guys. In my haste to stop work this summer because of record heat in Phoenix, I forgot to torque the plug. That’s why the gasket did not compress. I feel stupid for asking the question. I will be looking for some copper washers this plastic does not seem like it will last very long. 🥴
dont worry about feeling stupid for asking the question just think of how stupid you would have felt if it had vibrated out on a long run ......good catch !