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. The gasket features a hood with a straight edge that snaps into the straight edge of the barb. This straight edge to straight edge force eliminates gasket blowouts. The depressor is barbed and locks into the gasket, meaning the outward force on the depressor pushes the gasket further into place, resulting in no blowouts. 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. Kobra high pressure hoses are made from Kevlar - the same material that stops bullets in bullet-proof vests. This provides a 5 to 1 safety factor (better than the industry standard of 4 to 1). Kevlar makes our hoses incredibly strong and flexible. Kobra hoses feature a nitrile cover which is better than neoprene because it is more resistant to oil, giving the hoses a longer life. 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.