https://ph.parker.com/us/en/product-list/600-series-stat-o-seal
ms28775-008
600-0102-10 number 10 nitril
600-3130-10 O/S florocarbon
600-0742-10 Chromemoly neoprene
Old pn 600-0000-10
? Still available?
https://www.zatkoff.com/parts/stat-o-seals/stat-o-seal-nitrile-600-0000-10