1.Excellent quality and reasonable price 2.stainless steel coupling 3.Standard:DIN,SMS,3A,ISO 1).Item:stainless steel coupling2).Material : stainless steel (304,304L,316L,316)3).Standard : DIN , SMS , 3A, ISO4).Surface: polishing5).Application :dairy food , cosmetic , pharmacy , beer , foodstuff .......these sanitary fields .