These Tight Fit A/C Elbow fittings were designed by PURE Choice Motorsports specifically for 134 A Air Conditioning Systems, they allow the -6, -8 and -10 hose to fit tightly off the compressor, condenser, evaporator or bulkhead fittings. The dimension from the O' ring inside of the swivel nut to the top of the Elbow is on -6 (1.00) -8 (1.350) and -10 ( 1.650).
If you want to compare to hose ends look at picture on page.
P/N 15150 -6
P/N 15160 -8
P/N 15170 -10