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Secure the casters by inserting and tightening ^" screws into the pre-drilled pilot holes on the fittings with a Phillips screwdriver. Step 3 Insert the PVC back with mesh sling into the opening of the fittings. Secure the back with ^" screws. NOTE: Casters and PVC mesh back must be checked and secured prior to using the shower chair. Care Instructions: PVC Piping and Casters Wipe down piping with non-abrasive cleanser. DO NOT use solvents. Restore luster with Johnson's Pledge or similar