Prevent potential damage due to back flow. FPT x FPT Swing Check Valve (Clear) offers aquarium hobbyist plumbing peace-of-mind by preventing the backflow or siphoning of aquarium water. Install highest quality check valves on the return pump line or any place inline where you want to stop backflow. No metallic parts for reliable, corrosion resistant aquarium installation. FPT (Female Pipe Thread) fitting on both ends.
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