TRI CLAMP SIZE? PLS HELP

[BlackCap]

I bought a variable capacity wine tank which is missing a sample valve. I'd like to order a sample valve but am unfamiliar with the size. Can anybody identify the correct size from the photos below?

 

[stickman]

The following may help.

 

[sour_grapes]

I consulted a chart similar to the one Stick posted. I concluded it may not be a tri-clamp! Do you know anything about the country of manufacture of the vessel?

 

[BlackCap]

It's Italian, Paisano.
Prospero SEK 1000.

I called the company. The rep I talked to wasn't very knowledgeable. She could not give clear answers, but said 1" triclamp. She said they have none in stock.

It's very difficult to find a 1" sample valve with measurements posted on the ad so that I may buy with assurance.

The OD of the ferrul is 34mm.

I do find them with 34mm OD from China. I try my hardest to avoid Chinese SS.