Two Full Milk Collector Cup Sets with 21mm Flange Compatible

In this review the focus is on a practical replacement kit for owners of Momcozy S12 Pro and S9 Pro wearable pumps. The set includes two full collector assemblies and the key soft silicone components that affect comfort and leak prevention, so the single biggest reason to buy is to restore or duplicate the pump parts you use most often without paying for an original brand set. It is a functional, budget replacement that aims to match the pump geometry and provide a soft-touch seal during pumping sessions.

Key Features

• Complete two-set kit: Each package contains two 21mm flanges, two milk collector cups and matching duckbill valves, diaphragms and linkers so you can replace both sides at once.
• Model-specific fit: Designed to be compatible only with Momcozy S12 Pro and S9 Pro pumps, which helps ensure the parts align and seal correctly for those specific models.
• Closed system design: Dual channel anti-backflow construction separates gas and milk to reduce contamination risk and prevent milk from reaching the motor.
• Leak-prevention elements: The silicone diaphragm and one-way duckbill valve direct milk flow and aim to reduce leaks when assembled and seated properly.
• Safe material and cleaning guidance: Made from food-grade BPA-free silicone that is soft and odorless, and safe to sanitize with boiling water or steam for 5-10 minutes.

Who It's For

This kit is best for parents who already own a Momcozy S12 Pro or S9 Pro wearable pump and need an affordable replacement set of flanges, collectors and valves. It is useful for anyone who prefers to keep a spare full set on hand for travel or to swap between washing cycles.

It is not suitable for owners of other Momcozy models such as S12 or S9, or other brands, so buyers who are unsure of their pump model should check compatibility before purchasing. Those needing OEM-certified parts for warranty or long-term durability may prefer original manufacturer replacements.

Pros & Cons

Pros

• Complete replacement of both sides in one package saves time and ensures matched parts.
• Soft food-grade silicone flanges improve comfort and can reduce soreness during use.
• Closed system and duckbill valve design help prevent milk backflow and protect the pump motor.
• Lower cost than branded originals, offering good value for occasional or backup use.

Cons

• Mixed quality reports from customers mean occasional defects or sturdiness issues may occur.
• Some users have experienced leakage, so proper assembly and inspection are required after each cleaning.

Specifications

Package Content	Two full sets: 21mm flange x2, collector cup x2, duckbill valve x2, diaphragm x2, linker x2
Compatible Model	Only Momcozy S12 Pro and S9 Pro
Material	Food-grade BPA-free silicone
System Type	Closed system with dual channel anti-backflow
Cleaning	Wash with warm soapy water; sterilize 100C for 5-10 mins
Manufacturer	IVARONAL (third-party replacement)

Our Verdict

This two-set replacement kit is a sensible value option for Momcozy S12 Pro and S9 Pro owners who need spare or replacement pump parts. It recreates the key comfort and anti-backflow features of the original assemblies at a lower price, though buyers should inspect parts for defects on arrival and confirm model compatibility. For most parents looking for comfortable, affordable spares, this kit is worth considering.

Frequently Asked Questions

Will these fit my Momcozy S12 Pro?
Yes, they are designed specifically for Momcozy S12 Pro and S9 Pro models, but they do not fit S12 or S9 models; check your pump model before ordering.

Are these closed system parts?
Yes, the parts use a closed system with a dual channel anti-backflow design and a duckbill valve to help prevent milk backflow into the motor.

How should I clean and sterilize them?
Wash with warm soapy water and rinse well; you can then sterilize with boiling water or steam at about 100C for 5-10 minutes.