... )Comprises of:brass body of fittings,cut-ring and nut,3)Raw material:brass for different type:DZR,CW617,CZ132,Normal Brass ... ,suitable for cold water,hot water and gas applications...brass press fitting coupling (union) is made of brass body,EDPM seal rings,stainless steel ... SUS 304 sleeve and plastic ring.Brass body material can be CW617N, CW602N ...