Compatible with both the XL AND the XXL line of moss poles (it can even be dropped into the D-Line), this add-on allows you to slowly release water into your moss pole, via a controlled drip valve to make it more self-watering. The container holds about 600 ml of liquid (over a pint), and the rate of drip can be adjusted. This is best used when going on a trip, where the concern may be that your pole will dry out over the course of several days. The valve may clog over time due to impurities in the water, so clean the valve by removing the light blue tip and washing the system with warm water and mild soap. As with all 3D printed objects, there may be some slight leakage at the "seams" of the print when you first start using the drip cap. This is quite normal, and over time those leaks will seal on their own as the plastic swells with water absorption! If you want a specific colour, leave a comment in the order note.