Andersen Perma-Shield Casement Windows - Straight Arm Operator w/screws - Corrosion Resistant - RHAndersen Straight Arm Operator, Corrosion Resistant, 14" Arm, Right Hand, 1995 to Present This corrosion resistant casement operator is for a right hand window A right hand unit will have the lock on the right hand side viewed from the interior. The current operator replaces all previous units Direct Replacement for E Z casement window units manufactured 1999 to present. windows manufactured from 1995 1998 an adaptor plate is necessary for