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

First, it is very easy to install. Simply place the o-rings in the grooves in the plastic housing and then simply pull out the old diaphragm assemblies and slide in the new one. Just make sure the o-rings stay in place and don't pop out when you put the new case in place. Your pump is literally like new. Expensive, I'd just buy a new air pump if I could get it for 60/100, but I have an APK100 so it costs money to replace the diaphragm case.