Neoperl flow regulator, diameter 18.7 mm, 10 L / min, blue, 58,864,012 (tool)
This Neoperl water savers are an absolute hit! My roommate turn principally on the shower to stop and let the water even while you run to lather. Since go depending on water pressure by up to 35 liters / min. Due to this water saver, you can reduce t