Date: 04/19/2006 Views: 7525
Date: 12/31/1969 Views: 5201
Date: 07/15/2007 Views: 12333
Date: 08/23/2023 Views: 798772
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.