This is a 15 Psi Blumat Pressure Reducer that has all of the fittings and adapters to allow you to fit this into 1/2" tubing ideal for PVC, PolyPipe, Drip Tube, PEX, etc. Great for being able to get optimal pressure for your Blumat System, but can now be implemented into your existing 1/2" pipe so that you can get the optimal pressure from your own supply line, then lead into the 8mm tubing from that main line.Got multiple rooms running a Blumat system? Integrate this 1/2" Blumat Pressure Reducer into the main water supply line before going into each individual room.