I really think that these are the best quality made drip irrigation Manifolds'. I have purchased 10 of these at Lowe's for $7.99 a piece. I recently have found that they are also sold at The Do-it-center in Simi Valley California for $6.99 each. I have also used the Rainbird and DIG systems and found that I do not like them nearly as much. The main thing that I like about these Orbits are that the green arms can be adjusted and moved, but mainly the design and performance. I hook these up to 1/2 inch barbed tees which essentially makes it a 16 outlet system. I then attach either a 1/2 gph, 1gph, 2gph dripper depending on what I am watering and I am done. I successfully water 16 garlic plants with a single manifold. I also water 8 tomato plants with a single manifold with each tomato receiving 2 drippers 1gph, for a total of sixteen. I have also used the Orbit 67025 Quad Full-Flow Manifold and found them useful for watering my Apple, Apricot,peach, and citrus trees.  These are a must for my vegetable garden because they do not get the leaves or plant wet, only the soil and roots, which helps to prevent disease and mold. These things have literally changed my life. I LOVE GARDENING.