Date: 12/31/1969 Views: 3563
Date: 10/30/2007 Views: 4670
Date: 02/11/2009 Views: 2876
Date: 08/23/2023 Views: 90523
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.