Part number 11088 is a low pressure relief valve. The valve is all stainless steel construction except for the titanium 0.75 inch Dynatube outlet fitting. The valve seat is sealed by a ethylene propylene o-ring. The equivalent square edged orifice diameter is 0.298 inch. The rated operating pressure is 1.5 to 15 psig and the valve cracks at 5 psig minimum.