Washdown Gun Relief Valve #40029 3/4" Washdown Gun Relief Valve. Complete Assembly. 700 PSI. Brass T Handle SELECT QUANTITY Stock # Description Price Qty VTR 40029 3/4" Washdown Gun Relief Valve. Complete Assembly. 700 PSI. Brass T Handle 99.99 Related Products Hydro-Excavation Hose Quick ConnectsWashdown Gun 45109Hydroexcavation Hose