So how do Outdoor Water Hydrants Work?
When the handle of the hydrant is raised, the lifting rod lowers the plunger and blocks the check valve or bleeder. The water flows out of the spout at the top of the stand pipe. Most hydrant spouts are equipped with a threaded brass male hose fitting. When the handle is lowered, it lifts the plunger and any water left in the standpipe drains out through the bleeder/check valve.
A yard hydrant acts as an outdoor faucet. It’s installed at a farther distance from your home. The purpose of a yard hydrant is to irrigate or supply water to an area of your property where using a hose would be inconvenient or inaccessible.