Starting from these considerations, we have a gearbox with a motor mounting flange that is separable from the housing which incorporate the oil seal; in this manner we avoid any risk of damaging the essential oil seal in the event of replacement of the input flange and the O-Ring could be eliminated.
All the aside covers, swinging and with ft, have O-Rings rather than traditional flat gaskets.
The sizes 03-04-05 permit the rotation of the feet without disassembling them; furthermore the worm gear unit versions with swinging apart covers permit 
the lateral flanges to become installed on both sides with basic fixing screws.
The worm screw has a ZI involute profile: with this worm-wheel coupling we will get a better performance with a temperature reduction.
The gearboxes and motors are painted with RAL 9022 aluminium colour epoxy powder to safeguard the parts from oxidation and against micro-blowholes that can come through the pressure of die-castings.
The CHPC pre-stage gears (already present in the catalogue of CHM) can also be mounted with this range, obtaining a gear ratio up to at least one 1:300. For bigger reductions can be done to have two gears jointly using a proper kit