The Betts FVAH716BXB is a 16-inch Model PAF 306-98 manhole designed for MC306 tanks. This manhole features an integral 10-inch latch style fill and pressure relief valve with a 3.0 psig set pressure that meets the 1-liter surge leakage limit. The manhole includes a 6238AL aluminum pressure-vacuum normal vent mounted in the 10-inch relief valve cover and features Buna-N gaskets throughout. The assembly provides emergency pressure relief with rated capacity of 250,000 cubic feet free air per hour at 5.0 psig and liquid flow capacity of 1,012 gpm at 5.0 psig. The clamp ring style manhole is certified and marked in accordance with 49CFR178.345-5 with a test pressure of 36 psig.
