Date: 12/31/1969 Views: 10306
Date: 10/26/2008 Views: 9526
Date: 09/08/2009 Views: 4363
Date: 08/23/2023 Views: 784069
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.