"洒水装置的莲蓬头" can be translated as "sprinkler head" in English.
Here, "洒水装置" refers to a sprinkler system or device, and "莲蓬头" (literally meaning "lotus-shaped head" due to its resemblance to a lotus flower) is the part of the sprinkler that actually sprays the water, commonly known as the "sprinkler head" in English.