Product review (5 stars): A perfect replacement for the torn gasket in my 1997 Sub Zero model 550.
It is made of high quality material. I installed  it myself after removing the freezer drawer and putting it upside down on the kitchen table. The installation is not recommended for just anyone though because it takes some mechanical know how.  I went online first and found a description for installation from Sub Zero.  That is a requirement. I let the gasket lay out on the carpet for a good week of warm weather in order for  it to assume its natural shape.  My refrigerator doesn't run nearly as much as it did before with the torn gasket and I'm very happy.  Mr. Smith