4packs 21mm Full Breast Replacement Pump Parts for Spectra S1 S2

In this review the 4packs 21mm full breast replacement pump parts kit is evaluated for parents who need reliable replacement components for double pumping. The kit's single biggest selling point is that it provides a full set of interchangeable parts so a parent can resume regular pumping without hunting for individual pieces. The reviewer found the kit especially useful as a ready spare set for Spectra S1, S2 and other compatible pumps, and recommends it for anyone who wants to avoid downtime when valves or flanges wear out.

Key Features

• Complete 4-pack set: Four full sets of parts mean a user gets flanges, duckbill valves, backflow protectors, tubing, bottles and caps to support double pumping or to keep spares on hand.
• Broad compatibility: The kit fits Spectra S1, Spectra S2, Spectra 9 Plus, Synergy Gold and several other popular pumps so it can replace worn parts across multiple machines.
• Food-grade silicone: Components are made of BPA-free silicone that can be sterilized by steam or boiling, offering safe contact for milk and skin.
• Upgraded flange design: A soft rim with a longer, smoother tunnel aims to improve seal and comfort and to promote more efficient milk suction during pumping sessions.
• Leak-proof bottle system: Each 180 ml bottle includes a screw ring and sealing disc plus a one-piece cap for direct pumping and easy storage or travel without transfers.

Who It's For

The kit is for breastfeeding parents who use Spectra S1, S2 or compatible double pumps and want a full backup set of parts to avoid interruptions caused by wear or loss. It is also suited to those who travel or share pumping equipment and prefer having extra bottles and caps ready to go.

This is not an official original manufacturer accessory set; buyers who require branded OEM parts for warranty or service reasons should look for factory originals instead. Users who need custom flange sizes outside 21 mm should verify fit before purchasing.

Pros & Cons

Pros

• Complete replacement kit covers all common consumable parts so double pumping can continue immediately after installation.
• Made from BPA-free, food-grade silicone and designed to be heat-sterilized for hygiene.
• Longer tubing and improved flange profile help reduce milk entering tubing and improve suction consistency.

Cons

• These are third-party parts, not original manufacturer accessories, which may matter for some warranty or fit expectations.
• Flange size is 21 mm and may not suit users who require larger or smaller flange diameters.

Specifications

Brand	IVARONAL
Contents	4x flanges, 4x duckbill valves, 4x backflow protectors, 4x tubes, 4x bottles, 4x caps
Flange size	21 mm (includes 13 mm flange mention)
Bottle capacity	180 ml per bottle
Material	100% food-grade silicone, BPA free
Compatibility	Spectra S1/S2/9 Plus, Synergy Gold, Motif Luna, Cimilre, Ameda MYA

Our Verdict

This IVARONAL 4-pack kit is a practical value buy for parents who rely on Spectra and compatible pumps and want a complete spare set to avoid interruption. It combines safe, sterilizable materials with an improved flange shape and leak-proof bottles, making it a cost-effective way to keep pumping routines on track as parts age.

Frequently Asked Questions

Are these parts compatible with Spectra S1 and S2?
Yes, the kit is designed to be compatible with Spectra S1, Spectra S2 and several other popular pump models.

Can these parts be sterilized?
Yes, components are made from food-grade silicone and can be sanitized using steam or boiling water.

Do the bottles allow direct pumping and storage?
Yes, each 180 ml bottle includes a screw ring, sealing disc and one-piece cap so you can pump directly into the bottle and store without transferring milk.