Abstract: A detachable valve and slip joint structure is provided to permit removal of a basin pump. The structure includes an elbow joint attachable to the pump and having a lifting eye and a check valve to prevent backflow into the pump. The horizontal outlet from the elbow has a downwardly opening U-shaped flange and a pressure seal to engage a lip on a tubular outlet pipe which contains a 90.degree. plug or ball valve. The stem of the 90.degree. valve is attachable to a handle and carries a locking tab movable between stops. The tab engages the elbow when the 90.degree. valve is in its open position, preventing disengagement of the flange and lip slip joint until the valve is rotated to its closed position.