A kit for variable-length installation of a sanitary faucet on a water connection arranged flush-mounted or behind a pre-wall element, comprising:



a connection element that can be connected to the water connection and has an inner surface for guiding an adapter element of the kit in a longitudinal direction,
an adapter element, which has an outer surface matching the inner surface of the connection element, such that the connection element can guide the adapter element in the longitudinal direction, wherein the adapter element further has a connecting means, by means of which the adapter element can be connected to a sanitary faucet connection of the sanitary faucet,
a connecting element, which can be detachably connected to the connection element, wherein the connecting element is set up to guide the adapter element in the longitudinal direction and to secure it relative to the connection element.