Is the door seal on your Bosch washer loose or leaking? This little spring ring (also called a fastening band or clamp) is what secures the rubber door gasket to the outer drum. It's a direct replacement for Bosch part number 00439671. It fits a ton of Bosch WAA series models – we've listed a huge number of them in the description (like WAA12165SG01, WAA16160 series, WAA16161 series, and many more). To be sure, check the model number sticker inside your machine's door rim or on the back/side. Installation usually involves removing the old rusty or stretched ring and snapping this new one into the groove around the seal. It's a common fix that can save you from water leaks and keep your door closing tight. Make sure your model is on the list before ordering. A small part that makes a big difference for your washer's performance.