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573493A | Backflow Prev 1/2"SWT/NPT | Caleffi Cartridge Type_Duralast 1255 ensuring optimal system performance andCaleffi Backflow Preventer: A Reliable Solution for Industrial Applications (SKU: 573493A) The Caleffi Backflow Preventer is a high quality backflow prevention device designed to protect industrial water systems from contamination. This 1 2" backflow preventer features a durable construction with SWT NPT connections, ensuring reliable performance and longevity. The primary function of this backflow preventer is to prevent the reverse flow of