Child Restraint systems other than harnesses, restraints designed for use by children with physical disabilities, school bus child restraint systems, and booster seats 2. The cylinder specified rein S4.3(d) shall be inserted in the actuation portion of a lever released buckle for determination of compliance with the requirement. A buckle https://www.pdc.edu/?URL=https://www.ledteks.com/seatbelt-and-safety-belt-webbing