The thread 90-degree elbow features female NPT thread connections to join PP piping lengths together and to change the direction of piping 90 degrees. Chemtrol PP fittings are lightweight, easy to install and maintenance-free. Please refer to Chemtrol technical data sheets, chemical resistance guides and catalogs for engineering and installation information. Chemtrol® Chem-Pure® polypropylene exhibits extremely low content of metals, organic compounds, and free ions. No pigments or other adulterants are added to the plastic resin. Chem-Pure® natural polypropylene demonstrates excellent chemical resistance properties, including aqueous solutions of acids, alkalis and salts, and a number of organic solvents. Chemtrol® premium line of plastic fittings are backed by a 1-year limited warranty. Because Chemtrol® is a NIBCO brand the flow-control fittings are unsurpassed in quality, performance and longevity.