This adapter is a stainless steel 304 pipe fitting with female National Pipe Taper (NPT) threads on one end and male Metric threads on the other end for connecting two pipes of different sizes. The adapter has NPT threads for creating a tighter seal than straight threads and a hexagonal shape for increased leverage and use with a wrench during installation and disassembly. It is made from stainless steel 304 for resistance to chloride corrosion and greater corrosion resistance.