> Window Accessories For all YKK AP Window Systems Standardized Use on Multiple Systems YKK AP Window Accessories are designed to either provide structural support for our YKK AP Windows or to enhance the visual aesthetics thereof. Accessories are either system depth specific, or are universal. Product Benefits n Available system depths: 2-1/4 " , 3 1/2 " & 4 " n Head/Jamb receptors & Stacking Mullions n Trim & Clip and Edge Clip anchoring options n Strap Anchor and Twist Anchor options n Sill Flashings and custom panning options available n Applied Muntins are available Entrances | Storefronts | Curtain Walls | Sun Controls | Windows | Balcony Doors