The 4107 is a bronze and stainless steel throttle actuator, equipped with a manual override control to allow engine speed setting without air pressure. The 4105 comes equipped with an output rod that is adjustable with double lock nuts, typically meant for medium duty applications.
The 4107 comes in variable pressure ranges, and has a maximum input pressure of 200 PSI (13.8 BAR) with a 1/4" NPT.