The Post Insert for Biltmor Model is a replacement part made specifically for the Biltmor (5001) above-ground pool step system. It fits into the base of the step's vertical post and allows the PVC handrail to connect securely at the top. Over time, these inserts can become worn or damaged due to frequent use or exposure to the elements, so replacing the post insert ensures the handrail stays firmly in place, maintaining the safety and structural integrity of the entire entry system.