Quote:
Originally Posted by cw3jason
Its officially called a Vacuum breaker. it vents to the air to prevent a vacuum when the water hose has no pressure. turn water on to flush and the pressurized water pushes the check valve closed so water is directed to the tank for flushing.
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Thanks. Thought it looked a bit like one of those. I guess if it is a leaky device, it's because it is a cheapo version. Similar to the things used in commercial kitchens and outdoor sprinkler systems and probably inside our toilets to keep untreated water from getting into plumbing if pressure drops or vacuum occurs. Same reason kitchen and bathroom faucets are placed above waterline in sink. Maybe the one in the pix by OP is for the shower since it has a hand wand that could get into the water somehow.