SAE J1453 O-Ring Face Seal (OFS) This connection is designed for leak-free use to 6000 PSI. The o-ring in the face of the straight thread male end seals against the flat face female seat and is mechanically held in place by a swivel nut. Click here for a guide on how to properly measure threads. Click here for a printable, actual size O-Ring Face Seal fitting profiles. You will need to have Adobe Reader to view and print the file. 
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