Square, white abs plastic perimeter with 6.0 in. Round clear plastic screw-in center piece w/ rubber o-ring.
A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 6220-00-849-7894
NSN 5998-01-605-0692
NSN 5990-01-054-3332
NSN 5950-00-850-1168
NSN 6220-01-398-8937
NSN 2925-01-538-1343
NSN 5975-00-161-4947
NSN 5985-00-661-0488
NSN 5999-01-197-9737
NSN 6105-01-397-0804
NSN 5965-01-463-6367
NSN 5910-01-235-9483