reducing quick couplings. Size: couplings 1/4"-4". Standard:ANSI B16. ... :THD,SW,BW. Certificate:ISO9001 and CE Features:1.Product: reducing quick couplings.2.Size: couplings NPS 1/4"-4".3 ... .5.End type:THD,SW,BW.all the type of reducing quick couplings used depends on the environment.6.Pressure Rating ... ,3000lb,6000lb,9000lb.6.Certificate:ISO9001 and CE certificate approval. Reducing Quick Couplings