Wall Mount, Stainless Steel Booms for extended reach up to 78'. Two-piece assemblies are made up of a 180 degree wall boom extension and a 360 degree ceiling boom. Available in 18' 10" for smaller trucks or 38' 2" for full size semi-trailers. The large unit will effectively cover 76' and allow washing without moving the vehicle. Water inlet to boom extension is 3/8" FPT. Booms come with boom hose and 3/8" swivels rated to 2200 PSI.