This superior quality drop-in replacement protective rubber eyecup is compatible with AN/PVS-7 B/D, AN/PVS-14, NQ 6015, F6015, and Anvis AVS-9 night vision devices (NVDs). While providing a soft surface for contact with the eye, it also prevents light intrusion and hides visible glow on the face for more covert operation. Great replacement or back-up accessory for your NVDs. Diameter of the eye cup opening is 1.43''. NOTE: Your PVS-14, NQ 6015, F6015 or AVS-9 unit needs to have the Eyepiece Retaining Ring (or eyecup retaining ring) installed in order to use this rubber eyecup. This listing does NOT include the ring.