Feature: 1. Fish tank wavemaker pump, supports 5 variable diameter options, most pipe diameters are common. 2. Supports 360degree automatic rotation at a constant speed, truly realizing wavemaker without dead angle. 3. It adopts 6blade wide propeller impeller, utilizes water power and does not need power supply. 4. Strong power, suitable for all kinds of fish tanks, and promote water circulation in the fish tanks. 5. Fish tank wavemaking pump head accessories, using PTC shell, long service life. Specification: Condition: 100% Brand New Item Type: Wavemaker Pump Material: PTC Shell Size: Wavemaker Pump Upper Part: Approx. 5.7x4.2cm / 2.2x1.7in Wavemaker Pump Lower Part: Approx. 2.7x1.8x1.5cm / 1.1x0.7x0.6in Accessories 1: 23mm / 0.9in inner diameter connecting sleeve: suitable for use with 25mm / 1.0in outer diameter outlet pipe 18mm / 0.7in inner diameter connecting sleeve: suitable for use with 20mm / 0.8in outer diameter outlet pipe Accessories 2: 16mm / 0.6in inner diameter connecting sleeve: suitable for water pump 13mm / 0.5in inner diameter connecting sleeve: Suitable for water pump Product Function: If the wavemaker head is blocked in the gear fitting position during use, it may be stuck. However, the overall assembly and disassembly of wavemaking head is operated without tools. If the above situation occurs, please make wavemaking head disassemble it and clean it with clean water and then assemble it. . Package List: 2 x Wavemaker Pump4 x Accessory Note: 1. Please allow 02 cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.