DIG T.O.P. 12 Outlet Pressure Compensating Drip Manifold, Pack of 10DIGs TOP is an advanced pressure compensating drip manifold that offers a slow, precise application of water and nutrients directly to the plants root zone in a predetermined fashion. It contains flow regulating, self flushing drip emitters with a built in filter that perform at a wide range of operating pressures. Notes: This item is just the manifold and emitters. DIG has a TOP Manifold Assembly Kit that includes much more for getting started