FBFDDcr Stainless Steel Explosion-proof, Gas-proof, Odor-proof & Anti-overflow Floor Drain

The product has passed blast resistance and airtight leakage tests. It complies with the requirements for peacetime and wartime dual use of civil air defense basements below Grade 4.

Installed on drainage pipelines of civil air defense projects. It stays open at Position A for normal drainage in peacetime. In wartime, lower the drain and tighten it counterclockwise to seal the drain outlet at Position B. It blocks blast waves and toxic gas from entering the protected area and prevents odor leakage effectively.