Toro Riser Bubblers screw onto 1/2 MPT pipe or risers. Toro bubblers have a serviceable filter installed within them and can be easily adjusted with a flat screwdriver. DIfferent patterns are available to cover all your irrigation needs. These bubblers are not adjustable but can be purchased in a variety of different flow rates. Bubblers can be installed on the end of a extension tube, cut-off riser or on the top of a spray body. Sprinkler Warehouse provides an extensive selection of bubbler for risers, pipe nipples or extensions.