This 1 inch-11-1/2 H-Series ISO-B Poppet Valve Female NPTF Coupler from Dixon is designed as a rugged poppet style shut-off valve. It features stainless steel balls, springs, and retaining rings, hardened steel coupler sleeves, and crimped valve seals. Also, it meets the dimensional requirements of ISO 7241 Series B. Contact Littlejohn if you require a specific option like specialized seals.