Primefit TC1414FS6-B10-P 1/4-Inch 4-Ball Steel Female Automotive Coupler Contractor Pack, 10-Piece Premium 4 locking ball design for longer life Zinc plated steel construction for corrosion resistance Nitrile Seals for optimum performance in extreme temperatures Automotive/Truflate Style Interchange - Adapts to all Automotive/Truflate style plugs/nipples 1/4-Inch Body Size with 1/4-Inch (NPT) Female threads