The DBI-SALA® Sealed-Blok™ family has the most comprehensive line of sealed SRLs in the industry and decades of proven field service in the toughest environments. The heavy duty sealed design keeps the critical working components free of dirt, grease, water and chemicals. The range also includes a dual range SRL and automatic self rescue device. Ideal for use in harsh environments such as offshore, confined space, saltwater and dirty environments.