Quick Couplers (Schrader Core In Male End)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. Made in United States. Manufactured by Ritchie Engineering Co.