[QUOTE=Derek UK;1108373]The cap probably never got taken of after undercoating. If you can find one it would be a VERY good idea to try and find the tank neck to body seal. Item number 15 on the attached picture. Part number is #661727.
Pic shows the vent pipe and the way it routes to the vent shown in pic #1(the capped one). #7 is a grommet.
QUOTE]
Make me wonder how the previous owner got along with it plugged?
It had been switched to a B20 and Weber 32/36 somewhere during his 25 year ownership. I best only worry about here and now.
I thought that seal # 661727 was a puddy of sorts the way it came apart when POR 15 sealing the tank.
Good info!