Hydrostatic loop

A hydrostatic loop, though not often used in plumbing practice, is an arrangement of pipes formed into a vertical loop to prevent backflow of water within the plumbing potable water system. Since a siphon has a maximum height that it can work (about 33 feet), a hydrostatic loop is built higher than 33 feet. There are several ways to prevent siphonage and an undesirable backflow of the water in a plumbing system.

Vented loops ^[1]

References

^ "HVL and PVL Series Vented Loops" (PDF). .groco.net. Archived from the original (PDF) on 27 March 2014. Retrieved 26 March 2014.

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