Tefen Nylon 6/6 Pipe Fitting, Bushing, Gray, 3/4" NPT Male x 1/2" NPT Female (Pack of 5) Bushing for connecting two pipes with different diameters Male National Pipe Taper (NPT) threads on one end and female NPT threads on the other for connecting pipes with different ends Nylon 6-6 for high strength and flexibility, abrasion resistance, and a higher melting temperature than Nylon 6 Working pressure of up to 200 psi Meets NSF/ANSI standard 61 for drinking (potable) water