VRT3-250 Pressure Washer Unloader, 3650 PSI, Adjustable Knob, Blue Spring by | Jul 24, 2026Material Brass. Exterior Finish Brass. Spring Color: Blue. Made with durable brass. Relieve built up pressure within your pump. Number of Ports 2. Need more than the quantity listed?. By-Pass Port Fitting: 2 x 3/8″ F.