Feature:1. The powerhead water pump has 360 automatic uniform rotation, and is exquisite and compact.2. The powerhead water pump is common to most pipe diameters, and has five variable diameter options.3. No need to plug in and 0 energy consumption, the fish tank makes waves with advanced technology.4. Adopting 6 blade wide propeller impeller, using the principle of hydrodynamics.5. The main water flow of the original tank drives a uniform rotation without power supply.Specification:Item Type: Powerhead Water PumpMaterial: PTC ShellProduct SizeAdapter sleeve with 23mm inner diameter: Suitable for 25mm outer diameter outlet pipesAdapter sleeve with 18 mm inner diameter: Suitable for 20mm outer diameter outlet pipesAdapter sleeve with 16mm inner diameter: Suitable for water pumpAdapter sleeve with 13mm inner diameter: Suitable for water pump.Package List:1 x Water Pump Automatic Wave Head4 x SocketNote:If the wave making head is blocked in the gear matching position during use, it may be stuck. However, the overall assembly and disassembly of the wave making head is operated without tools. If the above mentioned situation occurs, please disassemble the wave making head. Rinse it with clean water and then assemble it.