The Isolator with round flange from Webstone Valves has a round shape and bolt patterns designed to accommodate high-efficiency variable-speed pumps. It is available in three flange designs with FIP, SWT or PRESS connections in 1 1/2- and 2-inch sizes. All valves have a uni-body design, eliminating a leak path at the flange. 800/255-9529; www.webstonevalves.com.