Date: 12/31/1969 Views: 3301
Date: 09/30/2005 Views: 4453
Date: 12/31/1969 Views: 17611
Date: 08/23/2023 Views: 704393
External thread dimension of the tank opening area is a nominal 2.55 in or 64.77 mm. I say "nominal" as the dimension varies quite a bit around the opening.