The Rol-Loc features a unique self-locking, PVC-coated top clamp to securely lock SCBA cylinders without the need for straps or levers. To secure the cylinder, place the SCBA valve into the footplate, then press the cylinder against the top clamp. The top clamp will roll up and out of the way to accept the cylinder, and then lock closed behind it. To release the SCBA, simply pull on the release cord. NFPA compliant and third party tested to exceed the 9G standard. Fits st SCBAs with only minor adjustments. Easty to retrofit into new or old seats. Works with most center pull releases