1. Introduction
This instruction manual provides essential information for the proper use, assembly, and maintenance of your Momcozy Original S9 Pro/S12 Pro Replacement Accessories. These accessories are designed to seamlessly integrate with your Momcozy S9 Pro and S12 Pro wearable breast pumps, ensuring continued optimal performance and hygiene.
The replacement kit includes the following components:
- Milk Collector Cup (180ml/6oz capacity)
- 24mm Single-Sealed Flange
- Valve
- Diaphragm
- Linker

Figure 1: Momcozy S9 Pro/S12 Pro Breast Pump Accessories
2. Safety Information
Ensure compatibility with your breast pump model before use, clean all components thoroughly before and after each use, and inspect for damage to ensure safe operation.
3. Components Overview
Familiarize yourself with the individual components of the Momcozy S9 Pro/S12 Pro replacement kit. Each part plays a crucial role in the functionality and efficiency of your breast pump.

Figure 2: Individual components of the Momcozy S9 Pro/S12 Pro replacement kit, including the milk collector cup, flange, valve, diaphragm, and linker.
4. Setup and Assembly
Proper assembly of the accessories is vital for effective and comfortable breast pumping. Follow these steps carefully:
- Attach the Diaphragm to the Linker: Gently press the silicone diaphragm onto the top of the linker until it is securely seated.
- Attach the Valve to the Linker: Insert the duckbill valve firmly into the bottom opening of the linker. Ensure it is facing the correct direction for milk flow.
- Connect the Assembled Linker to the Flange: Align the assembled linker (with diaphragm and valve) with the opening on the 24mm single-sealed flange and push it firmly into place.
- Insert the Flange Assembly into the Collector Cup: Carefully place the flange assembly into the milk collector cup, ensuring it sits flush and creates a tight seal.
- Attach the Motor: Finally, connect the assembled collector cup with accessories to your Momcozy S9 Pro or S12 Pro breast pump motor. Ensure a secure connection to prevent leaks and maintain suction.

Figure 3: Visual guide for assembling the Momcozy S9 Pro/S12 Pro breast pump accessories.
Choosing the Right Flange Size
Selecting the correct flange size is crucial for comfort and efficient milk expression. Refer to the video below for guidance on how to measure and choose the appropriate flange size.
Video: Momcozy Breast Pump Flange/Insert Size Selection Guide. This video provides instructions on how to measure your nipple and select the correct flange size for comfortable and efficient breast pumping.
5. Operation
Once assembled, the Momcozy accessories are ready for use with your S9 Pro or S12 Pro breast pump. The 180ml (6oz) capacity collector cup allows for ample milk collection during pumping sessions. The upgraded single-sealed flange is designed to enhance the seal, ensuring efficient milk expression.

Figure 4: Momcozy breast pump full set collector cup components are made from BPA-free, food-grade silicone and plastic materials, ensuring safety for your baby's milk.
6. Cleaning and Care
Maintaining the cleanliness of your breast pump accessories is crucial for hygiene and longevity. Wash all Momcozy S9 Pro/S12 Pro pump parts after each use with warm soapy water and rinse thoroughly. For sterilization, you may use boiling water or steam, with a temperature of around 100°C (212°F).

Figure 5: Momcozy S9 Pro/S12 Pro accessories are designed for easy installation and cleaning, ensuring convenience for mothers.
Replacement Guidelines
The expected service life of washable parts is typically 1-3 months. Please replace the parts in time if they become deformed or yellowed after prolonged use to ensure optimal performance and hygiene.
7. Troubleshooting Common Issues
If you experience issues with your Momcozy breast pump accessories, consider the following common troubleshooting steps:
- Loss of Suction: Check that all components (flange, linker, diaphragm, valve) are correctly assembled and securely sealed. Inspect the valve and diaphragm for any tears, cracks, or deformation, as these can significantly impact suction.
- Milk Leakage: Ensure the collector cup is properly attached to the flange and the motor. Verify that the single-sealed flange is creating a tight seal against your breast.
- Reduced Milk Output: Confirm that your flange size is appropriate (refer to the flange sizing guide in the Setup section). Ensure all parts are clean and free from residue that might impede milk flow.
- Discoloration or Wear: If any silicone parts (diaphragm, valve, flange) show signs of yellowing, deformation, or wear, replace them immediately as per the Replacement Guidelines.
8. Product Specifications
| Feature | Detail |
|---|---|
| Brand | Momcozy |
| Model Number | Pro PJ-M |
| Material Type | Silicone |
| Flange Diameter | 24 Millimeters |
| Collector Cup Capacity | 180ml (6oz) |
| Dishwasher Safe | Yes |
| Item Weight | 3.34 ounces |
| Country/Region of Origin | China |
9. Warranty and Support
For any questions, concerns, or issues regarding your Momcozy S9 Pro/S12 Pro Breast Pump Accessories, please contact Momcozy customer support. Detailed warranty information can be found on the official Momcozy website or by contacting their support team directly.
Visit the official Momcozy Store: Momcozy Store on Amazon