The SUNSUN YT-304 4 outlets large volume, which is ideal for medium-sized fish tank plus oxygen. It is perfectly suitable for using at all kinds of high-grade aquarium, aquaculture oxygenation, spout decoration, etc. Flow adjustable design, you can adjust the airflow any time. One of the most reliable and budget-friendly air pumps on the market. Powerful, high output pumps fulfill most aquarium air requirements and are built to ensure years of dependable, trouble-free use.