Andersen&reg; E-z Split Arm Operator (Left or Right) Corrosion Resistant - (1995 to Present) Works with Perma-Shield Improved/E-Z Casement Windows manufactured 1999 to Present. Casement Windows manufactured from 1995 to 1998 with the purchase of #9050723 adapter plate. This operator is universal and works for both left and right hand units. Old style operator covers will not fit this E-Z operator and must be purchased separately.