All TUSHY Bidet Attachments come with knobs—but sometimes you want to change things up! How It Works: You can just pop off the old knob and replace with the new one. Compatibility: Alignment is key here! Depending on your model the shaft the knob slides onto will be different, so see below to ensure you get the right fit. All of our knobs will fit the shaft of any model, but the dot that indicates on/off will only line up correctly by choosing the right model. This knob aligns well with: Classic 4.0 Pressure Knob Product Highlights: Material: Plastic with an electroplated brushed-metallic finish Simple installation, no special tools required Watch how easy it is to swap knobs