---
title: "momcozy s12 pro replacement parts — Niche Verdict: Skip it (40/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/baby-products/momcozy-s12-pro-replacement-parts"
last_updated: "2026-07-13T23:17:07.296Z"
locale: en
meta:
  description: "brand-locked demand (top 5 brands take 96% of clicks) — momcozy s12 pro replacement parts doesn't clear our bar today."
  "og:description": "brand-locked demand (top 5 brands take 96% of clicks) — momcozy s12 pro replacement parts doesn't clear our bar today."
  "og:title": "momcozy s12 pro replacement parts — Niche Verdict: Skip it (40/100) | Amazon United States - Flapen"
---

Back to Flapen home

# **momcozy s12 pro replacement parts**

**Skip it**

Brand-locked demand (top 5 brands take 96% of clicks) — this niche doesn't clear our bar today.

Market size 29Growth 18Conversion 67Competition 25Returns 45Price range 77Avg price 84Brand share 10Review moat 72Quality gap 55

**Avg price**

**Great****$18.42**

avg listing price — sweet spot $15–$100

**Price range**

**Great****$8.04–$38.69**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Review moat**

**Good****624.29**

avg incumbent reviews — the moat a new listing must climb

**Conversion**

**Good****6.0%**

search→purchase rate — share of searches ending in a sale

**Quality gap**

**Good****4.4★**

avg incumbent rating — lower means beatable quality

**Returns**

**Okay****3.6%**

return rate — above 6% kills the launch gate

**Market size**

**Okay****$128K**

$128K/yr · 116K searches

**Competition**

**Okay****70%**

top-5 click share — leaders hold, buyers still browse

**Growth**

**Bad****-13.4%**

90-day search growth — must beat 0% to launch

**Brand share**

**Bad****96%**

top-5 brand share — brand-locked demand

## **Competition**

The top 5 products take 70% of clicks — established leaders, but buyers still shop beyond them.

**Brands**

**7 **▼falling

**Sellers**

**9**

**Top-5 brand share**

**96%**

**Open market**

**2%**

- Momcozy45% - TOVVILD16% - IVARONAL16% - afontoto15% - JIMOWANG3% - MilkFlow2% - Open — no brand owns it (1 brand, 2%)

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%10%$13K20%$26K30%$38K40%$51K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 17 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with S9 Pro/S12 Pro Breast Pump NOT for S9/S12/S12Pro-Quick (Single-Sealed Full Set Collector 24mm Flange 180ml 1 Pack)](https://m.media-amazon.com/images/I/21pBF4S29+L.jpg)**Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with S9 Pro/S12 Pro Breast Pump NOT for S9/S12/S12Pro-Quick (Single-Sealed Full Set Collector 24mm Flange 180ml 1 Pack)**Momcozy**$26.55**4.4★867 rev](https://www.amazon.com/dp/B0G137VG73) [2![TOVVILD 12 Pack S9 Pro / S12 Pro / S9 / S12 Duckbill Valve Silicone Diaphragm Compatible with momcozy Breastpump Electric Breast Pump Replacement Parts Accessories](https://m.media-amazon.com/images/I/414sqpCSkkL.jpg)**TOVVILD 12 Pack S9 Pro / S12 Pro / S9 / S12 Duckbill Valve Silicone Diaphragm Compatible with momcozy Breastpump Electric Breast Pump Replacement Parts Accessories**TOVVILD**$11.69**4.4★1,539 rev](https://www.amazon.com/dp/B0DF2S5K6V) [3![Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with Momcozy S9 Pro/S12 Pro NOT for S9/S12/S12Pro-Quick (Double-Sealed Full Set Collector with 24mm Flange 180ml 1 Pack)](https://m.media-amazon.com/images/I/31YrxcwEEgL.jpg)**Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with Momcozy S9 Pro/S12 Pro NOT for S9/S12/S12Pro-Quick (Double-Sealed Full Set Collector with 24mm Flange 180ml 1 Pack)**Momcozy**$31.90**4.4★867 rev](https://www.amazon.com/dp/B0CYT5FJ9Z) [4![6 Pack Silicone Duckbill Valve & 4 Pack Silicone Diaphragm Compatible with Momcozy S12Pro/S9Pro/S12/S9 Wearable Breastpump momcozy Breast Pump Replacement Parts Breastfeeding Essential Accessories](https://m.media-amazon.com/images/I/51KiUWMkkFL.jpg)**6 Pack Silicone Duckbill Valve & 4 Pack Silicone Diaphragm Compatible with Momcozy S12Pro/S9Pro/S12/S9 Wearable Breastpump momcozy Breast Pump Replacement Parts Breastfeeding Essential Accessories**afontoto**$8.04**4.6★977 rev](https://www.amazon.com/dp/B0C4GFBXDR) [5![Two Full Milk Collector Cup Sets with 24mm Flange Compatible with Momcozy S12 Pro/S9 Pro Breast Pump NOT for S9/S12 Replacement Pump Parts with Duckbill Valve Flange Diaphragm Linker Collector](https://m.media-amazon.com/images/I/517SJkwHjpL.jpg)**Two Full Milk Collector Cup Sets with 24mm Flange Compatible with Momcozy S12 Pro/S9 Pro Breast Pump NOT for S9/S12 Replacement Pump Parts with Duckbill Valve Flange Diaphragm Linker Collector**IVARONAL**$38.69**4.4★251 rev](https://www.amazon.com/dp/B0DMJT8637)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![S9 Pro/S12 Pro/S9/S12 Duckbill Valve & Silicone Diaphragm Replacement Parts Compatible with Momcozy Wearable Breast Pump BPA-Free Food-Grade Silicone Accessories (6 Pack: 4 Valves + 2 Diaphragms)](https://m.media-amazon.com/images/I/41Wll1E3krL.jpg)**S9 Pro/S12 Pro/S9/S12 Duckbill Valve & Silicone Diaphragm Replacement Parts Compatible with Momcozy Wearable Breast Pump BPA-Free Food-Grade Silicone Accessories (6 Pack: 4 Valves + 2 Diaphragms)**MilkFlow**$10.04**5 rev2mo ago](https://www.amazon.com/dp/B0GYJG6CDG) [![Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with S9 Pro/S12 Pro Breast Pump NOT for S9/S12/S12Pro-Quick (Single-Sealed Full Set Collector 24mm Flange 180ml 1 Pack)](https://m.media-amazon.com/images/I/21pBF4S29+L.jpg)**Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with S9 Pro/S12 Pro Breast Pump NOT for S9/S12/S12Pro-Quick (Single-Sealed Full Set Collector 24mm Flange 180ml 1 Pack)**Momcozy**$26.55**867 rev4mo ago](https://www.amazon.com/dp/B0G137VG73) [![Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with Momcozy S9 Pro/S12 Pro Breast Pump NOT for S9/S12/S12Pro-Quick(Duckbill Valves & Silicone Diaphragm 1 Pack)](https://m.media-amazon.com/images/I/11EDqE7CI8L.jpg)**Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with Momcozy S9 Pro/S12 Pro Breast Pump NOT for S9/S12/S12Pro-Quick(Duckbill Valves & Silicone Diaphragm 1 Pack)**Momcozy**$14.02**867 rev5mo ago](https://www.amazon.com/dp/B0G13JTY5P) [![8PCS Silicone Duckbill Valve & 4PCS Silicone Diaphragm Compatible with Momcozy S12 Pro/S9 Pro/S12/S9 Breastpump momcozy Breast Pump Replacement Parts Breastfeeding Essentials Pumping Kit for Moms](https://m.media-amazon.com/images/I/41vA4V8k6RL.jpg)**8PCS Silicone Duckbill Valve & 4PCS Silicone Diaphragm Compatible with Momcozy S12 Pro/S9 Pro/S12/S9 Breastpump momcozy Breast Pump Replacement Parts Breastfeeding Essentials Pumping Kit for Moms**afontoto**$9.13**977 rev1y ago](https://www.amazon.com/dp/B0DP4HT3WK) [![14Pack Breast Pump Parts Compatible with momcozy S9 Pro/S12 Pro/S9/S12 Wearable Breastpump 10Pack Duckbill Valve & 4Pack Silicone Diaphragm Breast Pump Replacement Parts Breastfeeding Essentials Kit](https://m.media-amazon.com/images/I/51lGXti60XL.jpg)**14Pack Breast Pump Parts Compatible with momcozy S9 Pro/S12 Pro/S9/S12 Wearable Breastpump 10Pack Duckbill Valve & 4Pack Silicone Diaphragm Breast Pump Replacement Parts Breastfeeding Essentials Kit**afontoto**$10.36**977 rev1y ago](https://www.amazon.com/dp/B0DP4J783B)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![S9 Pro/S12 Pro/S9/S12 Duckbill Valve & Silicone Diaphragm Replacement Parts Compatible with Momcozy Wearable Breast Pump BPA-Free Food-Grade Silicone Accessories (6 Pack: 4 Valves + 2 Diaphragms)](https://m.media-amazon.com/images/I/41Wll1E3krL.jpg)**S9 Pro/S12 Pro/S9/S12 Duckbill Valve & Silicone Diaphragm Replacement Parts Compatible with Momcozy Wearable Breast Pump BPA-Free Food-Grade Silicone Accessories (6 Pack: 4 Valves + 2 Diaphragms)**MilkFlow**$10.04**4.8★**▲ 218%**](https://www.amazon.com/dp/B0GYJG6CDG) [![Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with S9 Pro/S12 Pro Breast Pump NOT for S9/S12/S12Pro-Quick (Single-Sealed Full Set Collector 24mm Flange 180ml 1 Pack)](https://m.media-amazon.com/images/I/21pBF4S29+L.jpg)**Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with S9 Pro/S12 Pro Breast Pump NOT for S9/S12/S12Pro-Quick (Single-Sealed Full Set Collector 24mm Flange 180ml 1 Pack)**Momcozy**$26.55**4.4★**▲ 198%**](https://www.amazon.com/dp/B0G137VG73) [![Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with Momcozy S9 Pro/S12 Pro Breast Pump NOT for S9/S12/S12Pro-Quick(Duckbill Valves & Silicone Diaphragm 1 Pack)](https://m.media-amazon.com/images/I/11EDqE7CI8L.jpg)**Momcozy Original S9 Pro/S12 Pro Replacement Accessories Only Compatible with Momcozy S9 Pro/S12 Pro Breast Pump NOT for S9/S12/S12Pro-Quick(Duckbill Valves & Silicone Diaphragm 1 Pack)**Momcozy**$14.02**4.4★**▲ 100%**](https://www.amazon.com/dp/B0G13JTY5P) [![One Full Set Milk Collector Cup 21mm Only Compatible with Momcozy S12 Pro/S9 Pro Breast Pump NOT for S9/S12 S12 Pro/S9 Pro Wearable Breast Pump Replacement Parts with 21mm Flange](https://m.media-amazon.com/images/I/41KWzDXVTbL.jpg)**One Full Set Milk Collector Cup 21mm Only Compatible with Momcozy S12 Pro/S9 Pro Breast Pump NOT for S9/S12 S12 Pro/S9 Pro Wearable Breast Pump Replacement Parts with 21mm Flange**IVARONAL**$19.17**4.3★**▲ 61%**](https://www.amazon.com/dp/B0DHGM2K4X) [![One Full Set Milk Collector Cup 17mm Only Compatible with Momcozy S12 Pro/S9 Pro Breast Pump NOT for S9/S12 S12 Pro/S9 Pro Wearable Breast Pump Replacement Parts with 17mm Flange](https://m.media-amazon.com/images/I/41fCiOQnZVL.jpg)**One Full Set Milk Collector Cup 17mm Only Compatible with Momcozy S12 Pro/S9 Pro Breast Pump NOT for S9/S12 S12 Pro/S9 Pro Wearable Breast Pump Replacement Parts with 17mm Flange**IVARONAL**$18.95**4.3★**▲ 57%**](https://www.amazon.com/dp/B0DHGNK4VP)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 103 weeks — -13.4% search growth over the last 90 days.

7K5KSpike '24Spike '25Black Friday '25 seasonDecMarJunAugNovMarMay

Peak months: Aug, Sep, Nov · busiest ÷ quietest = 2.7×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Size-Overall**31%

*“fits accurately”*

**Quality-Overall**17%

*“Overall, a great value and definitely worth having as replacements”*

**Compatibility-Overall**14%

*“Compatible with MomCozy S9”*

**Advertised Vs Actual Product**9%

*“these work exactly as expected”*

**Value For Money**7%

*“This is pretty affordable”*

**Leak-Proof**3%

*“No leakage when assembled correctly”*

**Ease Of Cleaning**3%

*“more convenient cleaning”*

**Ease Of Use**3%

*“Easy to Use”*

**Maintenance And Repair**2%

*“This pump collector is perfect for having a spare or if you need a replacement”*

**Assembly/Installation**2%

*“Came in handy”*

### **What buyers complain about **

**Value For Money**25%

*“I wish they were somewhat cheaper”*

**Size-Overall**17%

*“Doesnt fit”*

**Durability**13%

*“The collector cups fall apart before they can even be used”*

**Advertised Vs Actual Product**11%

*“I was very disappointed the sellers misleading description and you will be too if you buy this for any spectra products so save yourself the money and the stress”*

**Ease Of Use**10%

*“Maybe takes some getting used to”*

**Strength**7%

*“Very flimsy”*

**Compatibility-Overall**7%

*“Duckbill flanges are not compatible with S12 Pro”*

**Locking Mechanism**2%

*“Valves did not stay on very well”*

**Comfort-Overall**2%

*“Slightly less comfortable than the actual product”*

**Shape/Style**2%

*“My only real problem with them is that the flanges are flatter than the original”*

### **Top return reasons **

**Size-Overall**49%

**Compatibility-Overall**14%

**Advertised Vs Actual Product**9%

**Defective Material/Parts**9%

**Leak-Proof**5%

**Functionality-Overall**5%

**Quality-Overall**2%

**Product Condition**2%

**Connectivity-Overall**2%

**Value For Money**1%