Abstract: The bathtub shower system includes a fitting for screwthreaded connection to the bathtub faucet. The fitting cooperates with a backflow preventer assembly, including a quick connect/disconnect such that the backflow assembly can be readily and easily connected to or disconnected from the fitting. The backflow preventer assembly is coupled to a shower head hose for use by an individual reclining or sitting in a bathtub. The backflow preventer assembly prevents siphoning of water from the tub to the water supply in the event the water supply is curtailed or suctions the tub faucet. The quick connect/disconnect enables the shower system to be removed from the bathtub faucet while permitting the bathtub faucet to operate in a conventional manner.