Because adopts the ceramics sleeve and the ceramics shafts precisions cooperation, the is lower than 35 decibels, the power smaller even can reach 30 decibels, almost mutes effect adopts high ceramics shafts, high precisions, good shock resistance Built-in DCbrushless motor run smoothly, no electric, low and long service life Motor stator and circuit board part of the epoxy resin potting and completely isolated with the rotors to solve the long-term diving water pump problems, can be installed underwater and completely waterproof The water pump is only suitable for water circulation, not for water pressurization, installation (only for cold water) and completely waterproof Application: Water circulation, refrigeration, solar thermally, pipe circulation for water heater, water dispenser, floor heating, fountains