This large unit is 100 H.P. and is 30 ft long, about 3 rotations of the tire. The Modular Wash’s water sprays upward from below the tires. Side Blasters can be outfitted as well as tire guides and side walls. The system is turbine pump driven and can also be diesel driven. The STB 75’s and STB 100’s powerful wash sprays are the key mechanism to slowing the fast-paced trucks for a thorough wash.