The Grundfos CRIE 3-4 AN-CA-I-E-HQQE is a three phase stainless steel vertical multistage pump with integrated inverter. The Grundfos CRIE range of pumps are based on the CRI, which have all wetted parts manufactured from AISI 304 stainless steel, with the added benefit of a variable speed frequency inverter, which can lead to significant savings in energy, compared to running a fixed speed pump, but also in installation time as the inverter is pre-wired to the pump. Note: a Grundfos GO controller is required to commission these pumps.