MilkFlow 21mm Flange & Duckbill Valve 2-Pack for Spectra S1/S2/9 Plus – Replacement Pump Parts

Upgrade your pumping routine with MilkFlow

Designed as a practical replacement option, the MilkFlow 21mm flange and duckbill valve 2-pack supports daily pumping with compatible Spectra models, including S1, S2, 9 Plus, and Synergy Gold. This set brings together two 21mm breast shields and two reinforced duckbill valves, crafted to deliver reliable performance session after session without relying on original Spectra parts.

What’s included

• 2 × 21mm breast shields
• 2 × reinforced duckbill valves with easy-grip bases

Compatibility and use

These parts are designed to fit Spectra S1, S2, 9 Plus, and Synergy Gold pumps and work with Spectra wide-neck bottles as well as most wide-mouth bottles. This makes them a flexible option for households with multiple bottle types.

Design and durability

The duckbill valves are reinforced for longer life and daily use, while the easy-grip base supports quick, tool-free replacements between pumping sessions.

Materials and safety

All components are 100% food-grade and BPA-free, aligning with standard food-safety expectations for pump parts used with feeds and bottles.

Cleaning and care

• Dishwasher safe on the top rack
• Boiling safe
• Steam safe

Size options

While this kit centers on the 21mm shields, MilkFlow offers parts in a broad size range (13–30mm) to help achieve a comfortable fit across different users and bottle types.

Note: This product is an independent replacement set and is not an original Spectra accessory. It aims to provide a practical, compatible alternative for those seeking reliably sourced parts for routine pumping.