The Motif Aura Glow These diaphragms are genuine Motif replacement parts, creating an optimal closed system that acts as a protective barrier to prevent breast milk from entering the tubing or reaching the mother. This feature is essential for avoiding contamination and preventing the buildup of mildew or bacteria. To ensure your Motif Aura Glow Breast Pump operates at peak performance, replace your pump parts approximately every 90 days.