The manifold includes 3/4” NPT female inlet threads at each end and top to connect to a hose on the wheelhead. 1” wide nozzles can be switched on or off using plungers when using wheels narrower than the maximum width. Some plumbing is required. 2-6" widths are available. Nozzles included are 0.88″ wide to cover 1″ of wheel each. Drill and tap required for mounting adjustable arm. Mounting Bolts not included.