chip - the no-pressure was deco and earlier, I think by the 47 AD it was 4#, the TF series is 7#, not sure when that started, maybe 54?

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