Editor’s note: The following article is the second article of a two-part series regarding hydraulic tube fittings. This article will discuss O-ring face seal fittings and flareless bite-type fittings. Click here to read the first part. O-ring face seal O-ring face seal fittings (ORFS) have a fitting body, tube nut, sleeve and O-ring. The O-ring is seated in a captive O-ring groove (CORG) on the fitting’s flat face. The sleeve permanently attaches to the tube either mechanically (by flanging) or by brazing.

Editor’s note: The following article is the first of a two-part series regarding hydraulic tube fittings. This article will discuss 37º flare fittings. The second article will discuss O-ring face seal fittings and flareless bite-type fittings. From milking/feeding machines to tractors, skid loaders, tillers, bale choppers and even manure digesters, hydraulic tube fittings are an essential yet often overlooked component of proper dairy and forage equipment maintenance. Fluid leakage is a problem that virtually every farmer has experienced.