Shopping Cart (0) Quotes (0) Express Ordering All Categories > Piping > AQUApipe Stainless Steel Piping > Fittings > Male National Pipe Thread (NPT) Adapters > Advanced Search Advanced Search in Male National Pipe Thread (NPT) Adapters Unit of Measure Imperial Metric Both Specifications Nominal Diameter (in) No Preference 1 1/2 1-1/2 1-1/4 2 2-1/2 3 3/4 National Pipe Thread (NPT) Diameter (in) No Preference 1 1/2 1-1/2 1-1/4 2 2-1/2 3/4 Connection Type Male National Pipe Thread (NPT) Clear Cancel Advanced Search