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Message: <blockquote data-quote="Tazza" data-source="post: 10267" data-attributes="member: 82">Sorry Ken, i forgot about the fitting bit.The flat faced ones with an O-ring groove cut in the face we call ORFS (O-Ring Face Seal). From what i hear they have a reputation for being the best hydraulic seal on the market as they do not leak. They have an O-ring to create the seal not just metal on metal like standard JIC. This is all from what i have been told, so i can't say its true or not but all the gear my dad fits hose burst systems to use ORFS, the company that builds the machines swear by them.As for JIC with an O-Ring, i have never seen that type, but i can imagine it will provide a better seal than standard JIC. Thats the worst thing about JIC, you have to tighten it up so tight for it not to leak. I find that a lot of times i need a bar on each spanner to get the rotten things to crack!</blockquote>