For a 1 inch valve
A nonmetallic circular item with an aperature, having a solid round cross-section. They are used primarily for sealing. For items with other than round cross section, see packing,preformed. For noncircular items with a round cross-section, see seal,nonmetallic round section and rubber,round section.
NSN 5965-01-571-5678
NSN 5895-01-353-8018
NSN 5835-01-399-5820
NSN 5999-01-027-1810
NSN 5915-00-826-9318
NSN 6150-00-300-6452
NSN 5975-00-269-8391
NSN 6105-00-450-7657
NSN 7035-01-232-7263
NSN 5996-01-534-4963
NSN 5905-00-434-9680
NSN 6685-01-608-3733