Ryanfire TD Collar

Ryanfire TD Collars, also known as "drop-in" collars, are designed to maintain the fire resistance of fire rated floors where they are penetrated by various services.
The TD collars consist of a high quality stainless steel case lined with a highly reactive graphite infused material.
Upon exposure to heat the TD collar will quickly and effectively close any openings that may form due to the melting away of services.