Parker Hannifin Corporation Parker Brass Products Division Otsego, Michigan D3 D Catalog 3501E Flare Fittings ... Flare fittings are easy to disassemble and may be reassembled repeatedly, for a leakproof connection. ... 41FL4 1/4 7/1620 9/16 .257 .94 41FL5 5/16 1/220 5/8 .320 41FL6 .