I was trying to find the o-ring size for the petcock to tank but all I saw was the size for a vacuum petcock. Are they the same size? Also what are the fiber washers that go on the two screws. I couldn’t find anything on those. I’m guessing when the dent repair guy pulled my petcocks off it caused a leak issue. Before I order new sets for double the cost I thought I’d check here. Maybe we can add those to the o-ring thread.