Review on Derale 98201-8AN Female x 3/8" AN Swivel Hose Barb Fitting: Ultimate Connectivity for Optimal Performance by Mike Starling

I bought 2 of these for a 60psi fuel system, 1 of these came with an extra item that appears to be some kind of crush washer. First I tried both without the extra part and 1 leaked so I added a crush washer and it's still leaking. It's rubbish, you can tell by the surface of the joint that they used a low resolution CNC machine or something, the surface isn't even remotely smooth. The other one I bought is on the inlet side of the fuel pump and doesn't appear to be leaking, but there is almost no pressure on that side.