The thread 90-degree elbow features female NPT thread connections and is used to change the direction of flow. Please refer to Chemtrol technical data sheets, chemical resistance guides and catalogs for engineering and installation information. Chemtrol® black polypropylene demonstrates excellent tensile strength, UV stability and versatile chemical resistance properties, making it the material of choice for harsh industrial, outdoor and underground applications. Chemtrol® PP fittings are lightweight, easy to install and maintenance-free.