This Wilkins Series 700 check valve is designed for installation on potable water lines to protect against both back-siphonage and back-pressure of polluted water into the potable water supply. The Model 700 shall provide protection where a potential health hazard does not exist.
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Q:Is this threaded on both ends? Is it suitable for a water powered sump pump?
A:Yes and it is female threads both ends
A:Yes this has female threaded unions on both ends. I use this a backflow
A:Yes it is threaded on both sides. As far as backflow protection for a water back up, yes it will work. However you should check your local plumbing code to verify it is an acceptable device.
A:Yes, it's threaded on both ends. FNPT = "female national pipe thread", and FNPT x FNPT tells you