Pretty much the same thing to me. Open a faucet and the pressure switch is activated and water is delivered. The demand was created.
Close the faucet, pressure activates the switch and the water stops.
Delivery volume, speed and pressure are dependent upon the activation of a switch, plain and simple.
2013 Voltage 3800, 2012 Chevy 3500 HD
2010 Yamaha V Star 950
2009 Yamaha Raider
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