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What can I do if pump's delivery head is at lower point than suction head? Water keeps running even after turning off pump.
No, I haven't. How do I install a check valve?
You can install a check valve by screwing it onto the pump outlet. Make sure to install it in the correct direction to prevent reverse flow. If you're not confident in your plumbing skills, it may be best to hire a professional to install it for you.