Model ID duplex strainers are engineered for reliability and durability. The tapered plug valve, which diverts flow from one basket chamber to the other, has been designed to "lift" during the change-over process. This virtually eliminates all wear on the plug and body. Reversing the lifting operation reseats the plug, minimizing fluid bypass. The heavy duty castings are the thickest available, providing the highest corrosion allowance and longest life of any plug-type strainer. Designed with straining ratios of up to 15:1, the model ID is one of the most economical strainers to operate. When you factor in purchase and operating expenses, plus longevity, the model ID delivers the lowest life-cycle cost of any plug-type strainer in the industry.