Description: ALUMINUM SHELLSTELL SUB-FRAMES- GALVANIZED8" VALVES 8" X 4" GRAVITY TEE'S. ALUMINUM DISCHARGE TO LAST HOPPER THEN STEEL S BEND OUT REAR FLO-CONE AERATION. 3" TOP AIR W/ CHECK VALVES & BLOW DOWN LINE AT REAR STREET SIDE.AIR RIDE SUSPENSION(7) STEEL DISC & (1) ALUMINUM HUB PILOT WHEELS11R 22.5 TIRES