I don't know of ANY modern pump shotguns that don't have a disconnecter.
It's possible the Chinese made "Clone" of the Winchester Model 1897 can be fired this way, but since doing this is dangerous, and the operator can't really hit anything reliably, all modern guns have disconnecters.
As far as I know, the last American shotgun NOT to have a disconnecter was the Ithaca Model 37.
Ithaca too went to a disconnect long ago.