Description: ALUMINUM SHELLFOUR 20" FULL OPENING MANHOLES4" STEEL DISCHARGE OUT REAR4" BUTTERFLY VALVES4" X 4" STRAIGHT STEEL TEESFLO CONE AERATION WITH 2" INDIVIDUAL BALL VALVES AND TOP AIR4" LINE IN FRONT HEAD AND 4" LINE IN REAR HEADSPRING SUSPENSIONSPOKE WHEELSLP 22.5 TIRES