The 2 inch Dart Drippers are a first of a kind subsurface non-pressure compensating dripper. Deliver water and nutrients straight to the root zone of your plants with the subsurface design, which allows your water and nutrients to dispense wherever you desire below or within the media. Eliminates algae and use of pesticides by keeping the top of the media dry. 1/4 inch barbed nozzle. Made from BPA and lead-free plastic.