The PYREX PLUS Plastic Coated Glass 4000 mL Filter Flask, model 65340, is a high-quality lab flask designed for filtration purposes. Made in the United States by PYREX, this flask offers a large volume of 4000 mL and features a plastic coating for added durability. The flask is a unit quantity of 1 and is ideal for use in various laboratory settings, especially in the realms of medical, healthcare, and industrial research. Its reliable brand reputation and specific design make it a valuable and essential piece of glassware for scientific applications.