| APERTURE LENGTH | 1.478 INCHES NOMINAL |
| APERTURE WIDTH | 1.531 INCHES NOMINAL |
| CROSS-SECTIONAL SHAPE STYLE | SOLID SINGLE OR COMPOSITION |
| CROSS-SECTIONAL THICKNESS | 0.038 INCHES MINIMUM AND 0.046 INCHES MAXIMUM |
| HARDNESS RATING | 55.0 SHORE DUROMETER A NOMINAL EXTERNAL |
| MATERIAL | RUBBER FLUOROSILICONE CLASS FQ EXTERNAL |
| MATERIAL | SILVER AND ALUMINUM INTERNAL |
| III PART NAME ASSIGNED BY CONTROLLING AGENCY | O-RING, EYEPIECE |
| III PRECIOUS MATERIAL | SILVER |
| PROPRIETARY CHARACTERISTICS | PACS |
| STYLE DESIGNATOR | MARINE SQUARE |