Check the listing for details. VRT3 Pressure Washer ByPass Unloader Valve 10.5 Gpm 4500 Psi 194degrees. Condition: New. Listed at 108.00 USD. The VRT3 Unloader Valve is a high-pressure bypass valve component designed for pressure washers, capable of handling up to 4500 psi and 10.5 GPM. With a temperature rating of 194 degrees, this valve is durable and reliable for various cleaning: