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