Hose Box offers the solution to those leaking ORFS (O-Ring Face Seal) fittings, the ORFS Flat Face O-ring Kit. 150 replacement o-ring seals were specifically selected to provide service solutions for the most popular size ORFS (O-Ring Face Seal) hydraulic fittings between -4 (1/4") and -16 (1"). The Hose Box ORFS (Flat Face) replacement flat face o-ring kit is housed in a rugged 6" x 6" industrial-grade plastic compartment case filled with N90, professional-grade, hydraulic fluid-compatible O-ring seals.