Provided is optical glass that does not contain lead, which is an environmental pollutant. A method of depositing a benefit agent to the skin or hair with the ordered liquid crystalline phase cleansing composition is also disclosed. Each one of the plates is formed with an opening for receiving the cam tube and includes at least three tabs, and preferably four tabs, that extend outwardly from each respective plate adjacent the opening and contact the outer surface of the cam tube. This valve flap enables a plumbing snake to be inserted into and withdrawn from the plumbing valve.