... . Size: couplings 1/4"-4". Standard:ANSI B16.11. End type:THD,SW,BW. Certificate:ISO9001 and CE Features:1.Product ... steel,stainless steel,A105,A403,A420 etc.5.End type:THD,SW,BW.all the type of reducing quick couplings used depends on ... the environment.6.Pressure Rating:2000lb,3000lb,6000lb,9000lb.6.Certificate ...