Reducing coupling Size: NPS 1/4"-4". Standard:ANSI B16.11. End type:THD,SW,BW. Certificate: ... /2”EUE141.30*158.756.05Pipe coupling Size: NPS 1/4"-4". Standard:ANSI B16.11. End type:THD,SW,BW. Certificate ... : Pipe coupling,Reducing Coupling2.Size: NPS 1/4"-4".3.Standard:ANSI B16.11.4.Mateiral:carbon steel,stainless steel,A105,A403,A420 ...