I'd expect that Spectra tanks are about all you'll find except maybe some Chinese imitation, would like to see some references to the welds rusting, never heard that before ... Ni-Tern [nickel/tin] steel is the OEM approved material nowadays, and I believe Spectra tanks are externally coated after assembly, as well as having a warranty for use with E20

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics