Review on Tetra Whisper Repair Kit for 60 and 100 Air Pump - Durable and Efficient Solution by Ben Karlen

Good replacement part and the pump now works better than when bought! The only downside is the cost. I debated whether or not to buy another one, but finally figured I could get another pump in the short term and hoped the kit would fix those shortcomings. This kit corrects the deficiencies of the original design. However, you have to pay close attention to the installation. They simply slide in and out of the plastic case. Just remember the orientation of each one as you remove them. I recommend replacing one at a time and checking which direction the inlet and outlet holes are facing. New o-rings may need to be held with your finger while you press them into place to prevent them from poking through at the end. Hope that helps.