If you've removed your tap's old valves and are wondering why they don't resemble the new, replacement valves you've already purchased or the valves you intend to buy, it's probably because your tap's brass bushes' (also known as brass rings or backnuts) have become stuck onto its old valves. This is very common, especially when taps are older, and you can sometimes separate the valve and the bush. However, if this isn't possible, or, if you've tried to do so and have damaged the bush, you will need to purchase replacement bushes, as well as valves for your tap. These bushes are fully compatible with the Franke AtessaKitchen Tap.