This is a 15 Psi Blumat Pressure Reducer that has all of the fittings and adapters to allow you to fit this into 1/4" supply tube with 8mm on the output.Great for being able to get optimal pressure for your Blumat System, but can now be implemented into your existing 1/4" drip system so that you can get the optimal pressure from your own supply line, then lead into the 8mm tubing from that main line.