At least one embodiment relates to a quick-coupling mechanism including a clamp spring configured to receive a valve body. The clamp spring is coupled to a release button configured to manipulate one or more arms of the clamp spring. The quick-coupling mechanism includes a base structure coupled to the toilet pedestal/bowl. The base structure is configured to hold the clamp spring in place. In a locking-state, the clamp spring seats in a groove in the valve body thus securing the valve body in place and preventing an axial movement of the valve body relative to the clamp spring. In a non-locking state, the release button bends the arms of the clamp spring outwardly to increase the diameter of the clamping portion, thus releasing valve body such that the valve body can move axially relative to the clamp spring.