10 121244379 GASKET:COPPER,26.3-26.6 MM APERTURE DIA MATERIAL: OVERALL COPPER; MATERIAL DOCUMENT AND CLASSIFICATION: OVERALL DIN7603, CU ASSN STD SINGLE MATERIAL RESPONSE; HARDNESS RATING: OVERALL 45.0 BRINELL NOMINAL; CROSS-SECTIONAL SHAPE STYLE: F21 RECTANGULAR METAL; CROSS-SECTIONAL THICKNESS: 1.8 MILLI EA 1