Global Filtration stocks thousands of O-rings, Gaskets, Packing’s and seal compounds that are approved to nearly every military, aerospace, ASTM, SAE, automotive, petroleum industry and commercial specification. The most widely used specifications are the AN, M, MS and NAS specifications. Military Specification O-rings Seals from QPL manufacturers. We can supply them in kits, bulk or individually packaged per MIL-P-4861.