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Check Valve and Anti-siphon for Aquariums

What is a check valve? An aquarium check valve prevents backflow. Normally, the return pump pushes water from the sump back to the aquarium. However, in a power outage water can siphon back and create a flood. An aquarium check valve stops the back drain. Want to know how to install a check valve for an aquarium? The check valve goes on the return line between return pump and return inlet.

PVC fittings are listed according to PVC pipe sizes, not the actual measurement of the part. PVC fittings are categorized by the types of connections they make:

MPT, or male pipe thread, has threads on the outside wall
FPT, or female pipe thread, has threads on the inside wall
A PVC slip fitting, or slip fit, has no threads and connects to PVC pipe
PVC insert fittings, or hose barb fittings, connect to aquarium tubing (not flex PVC pipe)
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