Product Description: Pedicure SPA chair part magnetic head for Lu'ra'co jet motor dimension: 3 3/8" diameter back head x 3 1/8" diameter front head. It will not leak as there is no shaft seal. This high quality magnet jet uses magnetic coupling technology. The Magnet-jet is easy to clean. Magnetic Head set ( Two base , Two magnetic impeller and Two cover.) This magnetic head perfect fit with all of the lu'ra'co magnetic motors. Precautions: 1. When the pump is started, it will detect if there is enough water within 15-18 seconds. It will stop if there is not enough water at that time. If you need to start after stopping, be sure cut off the power again and then so it can start. 2. when you find this product can not work, please check whether the pump if faulty. 3. Please feel free to contact us if you run into any difficulties.