This part is no longer made by Kavo. We checked everywhere we could before we decided to begin making them. This is designed to fit the KCH 100 - The Environment dental chair. I am now making 2 differemt versions of this same part. One is 3d printed nylon (90 day warranty) and has had extremely good success with average sized patients. I also make a heavy duty version out of milled Delrin (5 year warranty). If this piece breaks, the back of the chair will not go up properly. It is an easy replacement that should take less than an hour.