... /4"-4". Standard:ANSI B16.11. End type:THD,SW,BW. Certificate:ISO9001 and CE The API couplings for tubing and ... /4"-4". Standard:ANSI B16.11. End type:THD,SW,BW. Certificate:ISO9001 and CEFeatures:1.Product: Pipe coupling,Reducing Coupling2 ... ,A420 etc.5.End type:THD,SW,BW.6.Pressure Rating:2000lb,3000lb,6000lb,9000lb.6.Certificate:ISO9001 and CE certificate approval. Reducing ...