This straight union fitting connects a 1.5-inch male threaded equipment port on a pool pump, filter, or chlorinator directly to 1.5-inch PVC suction or return lines. The threaded central union nut allows you to quickly unbolt equipment for winterizing, seal replacements, or repairs without cutting into glued plumbing. Heavy-duty molded PVC construction and an internal rubber O-ring ensure a tight, leak-proof seal under continuous system pressure.