This Pyrex 500ml wide mouth Erlenmeyer flask is perfect for laboratory use. The flask is designed with a filter fitting size 22, making it easy to connect to other equipment. The brand PYREX is known for its high-quality glassware, and this flask is no exception. It is ideal for storing and measuring liquids, as well as for filtering and other laboratory applications. Whether you are in a business or industrial setting, or in the healthcare, lab, and dental fields, this flask is a valuable addition to your laboratory supplies.