Yes indeed as far as I know the D22 was aimed mainly at the markets in the TPD Zone ... howand ever, in Spain a couple of years ago I bought three TPD compliant Zeniths and found to my surprise that they would not fit on my Picos and overhung on my iSticks.
Externally they are larger but the innards are bigger to reduce the liquid capacity. I suspect however you won't come across these in the USA.
Externally they are larger but the innards are bigger to reduce the liquid capacity. I suspect however you won't come across these in the USA.