Ring seal and lid set, specifically designed for the CWB-20 (20L) multipurpose container. Converts the open container into a secure storage vessel, protecting the contents from dust, contamination, and evaporation. The ring fits around the container rim and securely locks the lid, creating an airtight seal — without the need for tools.

• Airtight closure: Prevents leaks and vapor loss of stored materials.
• Compatibility: Exclusively designed for the CWB-20 (20L) container — perfect fit.
• Chemical resistance: Durable plastic suitable for solvents and chemical solutions.
• Easy to use: Installation and removal without tools.