CLS Series hoses feature a secure seal fitting that opens to full flow. The revolutionary patent-pending design on our internal structure significantly reduces blowouts, provides maximum flow and automatically traps refrigerant discharge in the hose. JB also uses a common crimp that grips the full circumference of the hose yielding a maximum hold and uniform seal that prevents leaks and bursts. Pressure rating 800 psi and 4,000 psi burst. These hoses are suitable for R-410A and can be used with all common refrigerants except ammonia. As always, Kobra hoses are made in the USA.