Ashcathchers assist in keeping water pipes clean and allow there to be less maintenance. There are a variety of shapes and sizes. Some add extra percolation and others are strictly for catching ash. When buying a water pipe over 100$, they are sold as half off their original price. 45 Degree with Green Inverted Honeycomb Perc 90 Degree with 3 Blue Honeycomb Percs 90 Degree Swiss Perc 90 Degree with Green Honeycomb Perc 90 Degree Recycler with Pink Accents and Showerhead Perc 90 Degree with Showerhead Perc and Red Glycerin 90 Degree with 3 Arm Tree Perc 90 Degree with Periwinkle Beaker Perc 90 Degree with Decorative Glass Fish and Shells and a Flared 6 Hole Perc 45 Degree with Green and White Mushroom Perc 45 Degree with Wigwag Band, Blue Showerhead Perc, and Clear Ratchet Perc