Date: 12/31/1969 Views: 4121
Date: 12/01/2004 Views: 7357
Date: 12/31/1969 Views: 3838
Date: 08/23/2023 Views: 795529
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.