The Water Manifold 2″ x 1/2″Skt (4PT) is commonly used with 2 inch rigid pipe and 2 inch flexible rigid pipe.
Best to use a plumbing cleaner then pipe cement to assemble. Pipework pushes inside this part at the female end. At the male end it pushes in to a female socket.
Used when the piping for the water jets is supplied in half inch flexible hose. You would glue the half inch flexible hose inside the fitting.
2″ S x 2″ Spg x 1/2″(4) S