Use the Mushroom Bubbler to water small areas of flowers, shrubs, and trees. Adjust water from a light trickle to a full flow by turning the top screw. It has a filter to help prevent debris from clogging the nozzle. The filter is removable, so you can clean it when needed. Made of durable plastic with a stainless steel screw, the Mushroom Bubbler has a 1/2 inch female-threaded inlet.