PT Coupling Special Application Series Polypropylene Fitting, Reducer Nipple, 1" NPT Male x 3/4" NPT Male Reducer nipple for connecting two pipes with different diameters Male NPT threads on both ends for connecting pipes with female NPT threaded ends Polypropylene for chemical and corrosion resistance, high impact strength and flexibility, and less weight than fittings made from metal Maximum operating pressure of 100 or 50 psi Operating temperature range of -15 to +100 degrees