1" and 3/4" do not indicate diameter <br>The reducing hex nipple pipe fitting is made of 304 Stainless Steel and has male National Pipe Taper (NPT) threaded connections.<br> This reducing hex nipple fitting has one end smaller than the other for connecting two threaded pipes with different diameters, and it has a hexagonal head for an increased bearing surface when adjusting the fitting with a wrench.<br> It has male NPT threads for connecting to female threaded pipes, creating a tighter seal than straight threads.<br><br> Pipe fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries.<br>When purchasing pipe fittings, consider the application, as this will affect material type, shape, size and required durability.<br> Fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness).<br><br>Package Include:<br>1 Piece x Male Hex Nipple Threaded Reducer<br><br>