Tech tip from S.E. Az
.....These Roadside "Hose Joints",....e.g. auto parts stores seldom flush out a newly made line before handing it over to you.
They cut their bulk stock with chop saws, and the crap that the nipple end of the new fitting than pushes into it's dim recesses is not hydraulic system friendly.
Running a can of cheap aerosol parts cleaner through your "new" hose prior to hanging it is a SMART policy.
GTC