Resilient wedge gate valves from Mueller Water Products have an option for a purple pentagon-shaped wrench nut, intended for reclaimed water service installations. This wrench nut introduces two distinguishing features: a unique shape requiring a special key for improved security and a purple finish to quickly identify reclaimed water. Purple is recognized by the American Public Works Association to identify reclaimed waterline components. 800-523-8618; www.muellerwaterproducts.com.