Gorton equivalents?

David_30

Does anyone know the Gorton equivalent (i.e., 4,5,6,C or D) of the following older radiator vents:

Dole No. 1933
Dole "Syphon" vent
Ventrite #1 (adjustable) wide open
American Radiator Company No. 500

All of the above worked fine and provided a balanced system but need replacement and I'm trying to stick with Gortons.

Steamhead (in transit)

The info you want

is in Gerry Gill and Steve Pajek's e-book on balancing steam systems. Order your copy on the Books and More page of this site. All proceeds go to charity.

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DonS

Not all answered

I bought the ebook but it only covered one of the three vents in question. Any idea what the modern equivalent (preferably Gorton) of a Dole "Syphon" vent (no numbers on it) and also an American Radiator Company No. 500 vent? Thanks