On some spas with a 2 speed pump directly behind the control box to the right, the 2 speed pump can transmit noise from the pump directly to the control box and both affect the volume of sound and the operation of the unit. If you try to hold the pump with your hand or the piping the noise dampens because you are absorbing the vibration. We have found by modifying the pipe leading from the pump to a circular route to the right of the pump using flex pipe you can significantly lower the sound and the affect of vibrations. This kit is designed to provide you with necessary parts to do this modification along with instructions.