The FRV 30 surface cleaner is a game changer for surface cleaners. The dirty water is discharged through the rear hose. This makes rinsing not necessary, speeding cleaning times. This unit can be used inside or outside. The rollers are non marking, making them safe on just about any surface. The double ceramic roller bearings will provide a long life. This unit ships without nozzles. The fittings are European but we have adapters to make this fit most machines. 3625 psi and 140° F maximum.