**KERDI-MV Prefabricated Waterproofing Collars** The KERDI-MV waterproofing collars provide reliable waterproofing for pipe penetrations in accordance with DIN 18534 for wet rooms. These collars come in various sizes, allowing you to select the one that suits your pipe diameter. I had them stored in my garage for my projects, but I am getting out of the business now and thought someone else might find them useful. Please check my other listings. Feel free to contact me for more details!