The Bradley 107-371 is a 6" diameter yellow plastic dust cap designed to protect air lines and fittings from contamination and debris. This cap simply fits over the end of the airline, effectively sealing it off when not in use. Made from durable plastic, it provides reliable protection against dust, dirt, moisture, and other contaminants that can interfere with equipment operation an... https://partsfe.com/107-371-bradley-capdust-eye-wash-station