Yellow Jacket 19173 45 degree Coupler 5/16" Female QC x 1/4" Male flare w/Schrader valve for R-410A refrigerants. All couplers have Schrader valve cores in male flare end. Female coupler end has deep knurling for easy handling. Patented CH14 "Adjust-a-Valve" opener in all 1/4" female ends.