1. Introduction
This instruction manual provides essential information for the proper use, installation, and maintenance of your Bellababy Breast Pump Replacement Kit (21mm). This kit is specifically designed for use with Bellababy Breast Pump Models BLA8040, BLA8040-2, BLA8042, and BLA8042-2. Please read this manual thoroughly before using the replacement parts to ensure optimal performance and safety.
2. Product Overview and Compatibility
The Bellababy Breast Pump Replacement Kit (21mm) includes essential components to maintain the functionality of your compatible Bellababy breast pump. The primary component is the 21mm flange, designed for comfortable and efficient milk expression.

Figure 1: Bellababy 21mm Breast Pump Flange. This image displays the 21mm breast pump flange, a key component of the replacement kit. The size '21mm' is clearly indicated on the flange.
2.1. Compatible Pump Models
This replacement kit is compatible ONLY with Bellababy Breast Pump Models BLA8040, BLA8040-2, BLA8042, and BLA8042-2. Ensure your pump matches the models shown below for proper fit and function.

Figure 2: Compatible Bellababy Breast Pumps. This image illustrates two Bellababy breast pump models (BLA8040 and BLA8042 series) that are compatible with this 21mm replacement kit. These models feature a distinct pump unit design.
2.2. Incompatible Pump Models
This replacement kit is NOT compatible with other Bellababy breast pump models. Using incompatible parts may lead to improper function, reduced performance, or damage to your pump. Please refer to the image below to identify models that are NOT compatible.

Figure 3: Incompatible Bellababy Breast Pumps. This image shows two Bellababy breast pump models that are NOT compatible with this 21mm replacement kit. These models have a different design, indicated by a red 'X' mark.
3. Setup and Installation
Before first use, inspect all components for any damage. Wash and sterilize all parts that come into contact with breast milk as per the cleaning instructions.
- Disassemble Your Existing Pump: Carefully detach the current flange and collection cup assembly from your Bellababy breast pump motor unit.
- Identify Replacement Parts: The kit typically includes a 21mm flange, a duckbill valve, and a diaphragm.
- Assemble the New Flange:
- Insert the duckbill valve firmly into the bottom opening of the 21mm flange. Ensure it is securely seated to prevent air leakage.
- Place the diaphragm onto the top opening of the flange, ensuring a tight seal.
- Attach to Collection Cup: Connect the assembled flange to the breast milk collection cup.
- Connect to Pump Motor: Securely attach the entire collection cup and flange assembly to the Bellababy breast pump motor unit. Ensure all connections are snug to maintain suction.
For detailed visual instructions, refer to your original Bellababy breast pump manual or the manufacturer's official support resources.
4. Cleaning and Maintenance
Proper cleaning and maintenance are crucial for hygiene and the longevity of your breast pump parts. All parts of this replacement kit that come into contact with breast milk are dishwasher safe.
4.1. Before First Use and After Each Use
- Disassemble: Separate all parts that come into contact with breast milk (flange, valve, diaphragm, collection cup).
- Rinse: Rinse parts under cool running water to remove milk residue.
- Wash: Wash parts in warm, soapy water using a dedicated brush for breast pump parts. Alternatively, place parts on the top rack of a dishwasher.
- Rinse Thoroughly: Rinse all parts thoroughly with clean water.
- Air Dry: Place parts on a clean paper towel or a dedicated drying rack and allow them to air dry completely. Avoid using cloth towels as they may leave lint.
4.2. Sterilization (Optional, but Recommended Periodically)
Sterilize parts by boiling them in water for 5 minutes or using a steam sterilizer designed for breast pump parts. Always follow the sterilizer manufacturer's instructions.
Important: Do not wash or sterilize the breast pump motor unit. Only clean the parts that come into contact with breast milk.
5. Troubleshooting
If you experience issues after replacing parts, consider the following:
- No Suction or Weak Suction:
- Ensure the duckbill valve is securely inserted and not damaged or torn.
- Check that the diaphragm is properly seated and forms a tight seal on the flange.
- Verify all connections between the flange, collection cup, and pump motor unit are snug.
- Inspect the tubing (if applicable to your pump model) for kinks or damage.
- Milk Leaking:
- Ensure the collection cup is securely attached to the flange.
- Check for any cracks or damage on the flange or collection cup.
- Discomfort During Pumping:
- Confirm that the 21mm flange size is appropriate for your nipple. Incorrect flange size can cause discomfort and reduce milk output. Consult a lactation professional if unsure about flange sizing.
If problems persist, refer to your original breast pump manual or contact Bellababy customer support.
6. Specifications
| Product Name | Bellababy Breast Pump Replacement Kit |
| Flange Size | 21mm |
| Compatibility | Bellababy Breast Pump Models BLA8040, BLA8040-2, BLA8042, BLA8042-2 |
| Dishwasher Safe | Yes (parts that contact milk) |
| Material | Food-grade materials (specific material not provided, general statement) |
7. Warranty and Support
For specific warranty information regarding your Bellababy Breast Pump Replacement Kit, please refer to the documentation included with your original breast pump or visit the official Bellababy website. Replacement parts typically have a limited warranty against manufacturing defects.
If you require assistance, have questions about compatibility, or need to report a defective part, please contact Bellababy customer support through their official channels. Keep your purchase receipt as proof of purchase.
Note: Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition. This product is a replacement part for a medical device.





