Wet rotor circulators. They are designed for the circulation of water in civil and commercial conditioning and heating systems. The BPH/DPH (two pole motor) e BMH/DMH (four pole motor) circulator motor shaft can be manually deblock. BPH and BMH are the version with the single motor while BMH e DMH corresponds to the circulators in the twin configuration. Flanged suction and delivery ports. All the models have an air vent plug. The twin version is supplied as standard with an automatic suction type valve incorporated in the delivery port to avoid water recirculating through the unit when it is not running; and a blank flange for servicing either of the two motors. The single phase version works at three speeds, the two phase version works at three speeds.