When and Why You Need to Replace Your Breast Pump Parts

To ensure your breast pump functions effectively and safely, regular replacement of its parts is essential. Over time, components can stretch, weaken, and develop microscopic tears, which can reduce suction and impact your milk supply. Furthermore, worn parts can be difficult to sanitize properly, creating a potential breeding ground for bacteria. Understanding the replacement schedule for each component is key to maintaining optimal pump performance and ensuring the purity of your expressed milk for your baby.

Valves and Membranes

Valves and their accompanying membranes are critical for creating suction. The constant pulling and releasing action causes these small silicone or plastic parts to wear out quickly. If you notice your pump seems less powerful than before, worn-out valves are a likely culprit.

Replacement Frequency: Every 1 to 3 months, depending on how often you pump.

Duckbill Valves

Many newer pumps use single-piece duckbill valves instead of the two-piece valve and membrane system. These perform the same function but can be more durable. However, they still wear out. The slit at the end of the valve can stretch and fail to close completely, which will significantly decrease suction.

Replacement Frequency: Every 1 to 3 months.

Backflow Protectors

Backflow protectors are vital for closed-system pumps, as they prevent milk from entering the tubing and motor. The flexible silicone diaphragm inside can lose its elasticity over time, compromising the closed system and potentially leading to mold growth in the tubing.

Replacement Frequency: Every 3 to 6 months.

Tubing and Breast Shields

While tubing doesn’t typically come into contact with milk in a closed-system pump, it should be replaced if moisture or milk residue ever gets inside. Breast shields (flanges) are durable but should be replaced if they become cracked, warped, or discolored to ensure a proper seal and prevent injury.

Replacement Frequency: Tubing as needed; breast shields every 6 months or as needed.


Staying on top of replacing your breast pump parts is a simple but crucial part of your pumping journey. It protects your milk supply, ensures your baby receives clean milk, and extends the life of your pump motor. Don’t let worn-out parts compromise your efforts. The Breast Pump Store stocks a full range of replacement parts for all major pump brands. Shop our selection today to keep your pump working like new.