This fire hose series include so many International Standard types such as STORZ, ANSI PIN, JOHN MORRIS, MACHINO , NAKAJIMA , ITALY , BOGDAN etc to be selected by you. Material:Aluminum alloy Pressure durable: a) Working pressure: 1.6mpa; b) Strength test pressure: 2.4mpa. These couplings have a very strong resistance property to high temperature, corrosion & pressure. Oil and gas resistant All of them are of excellent quality & competitive quotation for you. And we always promise speedy delivery. The sizes are 1-1/4" , 1-1/2", 1-3/4" , 2" , 2-1/2" , 2-3/4" , 3" , 4" , 5" up to6" Standards: ISO9001:2000 CCCF We are the qualified member of NFPA.