I'm looking for single-barbed hose barbs with male pipe thread, in both brass and aluminum. Currently I'm using multi-barbed fittings that I get from McMaster Carr (1/2" ID hose, 1/4 NPT). I've also ordered some stuff from www.portagespecialty.com but neither place has the single barbed fittings in brass or aluminum, only plastics.

Does anyone know of a supplier that could supply these in either brass or aluminum?