Used on 6 inch 150 lb steel, flanged swing check valve 5021-2. bonnet gasket mil-g-21032 TY1, cl a or b cancelled 28APR72; refer to mil-g-24716 or ansi/asme B16.20
0.204" hole diameter 17.196" overall length 4.100" overall width 6 bolt hole quantity gasket, top salt fog closed cell, medium soft density acrylic adhesive one side, rubatex (cage code 82942) p/n RN11n or equivalent