Peaceful Pleasures Health and Wellness
Breast Pump Replacement Parts – 24mm/27mm Flange S18/S21
Breast Pump Replacement Parts – 24mm/27mm Flange S18/S21
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Keep your breastfeeding routine running smoothly with this complete replacement parts kit designed specifically for S18 and S21 electric breast pumps. Whether your original parts have worn out or you simply want a reliable backup set, this kit includes everything you need to maintain peak performance and hygiene.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Why You'll Love This Kit
- Perfect Compatibility: Engineered exclusively for S18 and S21 electric breast pumps — a seamless drop-in replacement.
- Two Flange Sizes Included: Choose between 24mm or 27mm single sealed flanges to find the most comfortable and efficient fit for you.
- Improved Milk Collection: Upgraded single-sealed flange design enhances suction and sealing efficiency so you get the most from every session.
- Safe, Quality Materials: Made from food-grade silicone and PP (polypropylene) — BPA-free, easy to clean, and built to last.
- Use Anywhere: Whether you're at home, in the office, or travelling, this compact kit supports your lactation needs on the go.
- Everything in One Box: No need to hunt for individual parts — the full set is ready to use right out of the package.
Product Specifications
| Material | Silicone + PP (Polypropylene) |
| Available Flange Sizes | 24mm / 27mm (optional) |
| Breast Milk Collector | Approx. 120 × 110 mm (4.72 × 4.33 in) |
| Duckbill Valve | Approx. 25 × 20 mm (0.98 × 0.78 in) |
| Diaphragm | Approx. 40 × 55 mm (1.57 × 2.16 in) |
| Dust Cover | Approx. 115 × 125 mm (4.52 × 4.92 in) |
| Flange | Approx. 120 × 110 mm (4.72 × 4.33 in) |
| Compatible Models | S18 / S21 Electric Breast Pump |
What's in the Box
- 1 × Breast Milk Collector
- 1 × Duckbill Valve
- 1 × Diaphragm
- 1 × Dust Cover
- 1 × Flange (24mm or 27mm — select your size)
Made in Mainland China.
Please allow ±1–2 cm variance due to manual measurement. Slight colour differences may occur due to monitor display settings.
Helpful Breastfeeding Resources
For guidance on breastfeeding best practices and pump hygiene, visit the CDC's Breastfeeding & Breast Milk Handling Guide.
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Frequently Asked Questions
Q: Which breast pump models are compatible with this replacement parts kit?
A: This replacement parts kit is designed specifically for the S18 and S21 electric breast pumps. It is not guaranteed to fit other pump models, so please confirm your pump model before purchasing.
Q: What flange size should I choose — 24mm or 27mm?
A: Flange size is determined by the diameter of your nipple (not the areola). Most lactation consultants recommend measuring your nipple and adding 1–3 mm for a comfortable fit. If your nipple diameter is around 21–24 mm, choose the 24mm flange; if it's around 24–27 mm, go with the 27mm option. A proper fit improves milk output and reduces discomfort.
Q: How do I clean and maintain these breast pump parts?
A: All parts are made from food-grade silicone and PP, making them easy to clean. Rinse with warm water immediately after each use, then wash with mild dish soap or sterilise in boiling water or a steam steriliser. Always allow parts to air-dry completely before reassembly to prevent bacteria growth.
Q: How often should I replace duckbill valves and diaphragms?
A: Duckbill valves and diaphragms are the parts most prone to wear. Experts generally recommend replacing them every 1–3 months depending on usage frequency, or immediately if you notice reduced suction, cracks, or discolouration. Having a spare kit on hand ensures you're never caught without a functioning pump.
