These ends are specifically for use on all of our NL4200/4300 Series Composite Hose. Currently our list prices on these INCLUDE the labour attaching charge. Every hose assembly must have a stem, ferrule, rubber seal, and a mandatory carbon steel swaging ring which is sealed under the ferrule. The price of the ring and seal is included with the ferrule. The industry standard seals are nitrile rubber, and viton is available on special request only. All stainless steel ends come standard with "plated carbon steel" external ferrules, but optional stainless ferrules are available on special request.