The RainPro® RM4000-3 system is designed for speed of installation – no cables, no float, no solenoid, no electronic controls. The simplicity of this system has the added benefit of making it very affordable. The RM4000-3 stops flow of mains supply while rain water is being pumped to help conserve our precious resource. This system is suited for applications supplying laundry and toilets, and is also suitable for cabins or small houses with one bathroom. For larger whole house supply, we recommend to use the RM1500. This system is not suitable for suction lift, use the RM5000-3 submersible version for underground tanks.