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Message: <blockquote data-quote="Chalmers" data-source="post: 112336" data-attributes="member: 15979"><p>I have 2 possible work-arounds for High Flow machines: 1.Make sure the cartridges have the dash twelve(=3/4") For example FFH12M-46. I think this means a 46 mm cartridge with a 3/4" high flow port but when I contacted Summit Hydraulics to confirm ,they were not helpful. Summit emailed that they had no high flow fittings !Their Listings have the best photos of the dimensions of the cartridges, 2. Buy a complete N.O.S. 4BD4FH12 Coupler Block off Ebay for about $170 and assume that because it has the larger/newer 48mm cartridges it will also have 3/4" ports required for High Flow.Then try to get replacement O rings to repair your old Coupler Block. I have failed to find a part number for an O ring kit for any of the cartridges !Anyone got a #? The number "12" in the Coupler Block part number does not(??) mean 1/2"port diameter .It means dash twelve which is 12/16" =3/4", If you buy a Coupler Block ,make sure the fittings for the hydraulic lines match yours. Mine are JIC 3/4". Some Coupler Blocks have different (parallel or taper)fittings - look closely at the photos on EBay. If you can correct/confirm any of my assumptions please let the Forum know so we can help others in future.</p></blockquote><p></p>