21mm Flange Maymom Pump Parts Compatible with Spectra S2 S1 - Small

In this review the reviewer looks at the Maymom 21mm replacement pump kit for users of Spectra S1, S2 and 9+ units. It is aimed at parents who need a complete spare set of parts and want reliable compatibility at a lower price than buying original-brand accessories. The single biggest reason to consider this kit is that it supplies a full set of commonly needed components - flanges, backflow protectors, tubing, duckbill valves and wide-neck bottles with a rewritable two-piece cap - so you can replace multiple wear items in one purchase.

Key Features

• Full kit contents: Includes two 21mm flanges, two backflow protectors, two tubes, two duckbill valves and two wide-neck bottles with two-piece travel caps to cover both sides for most pumping sessions.
• Spectra compatibility: Designed to be interchangeable with Spectra S1, S2 and 9+ parts so users can mix and match without modification.
• Maymom quality: Manufactured by Maymom LLC and inspected under US FDA registration and other international health authorities, which supports material safety and regulatory compliance.
• Rewritable bottle cap: The two-piece cap has a writable surface for dates or baby names that can be erased with soapy water, easing storage and daycare labeling.
• Easy cleaning: Parts are safe for boiling, steam sterilizers and microwave steam bags so they fit common cleaning routines.

Who It's For

This kit is best for parents who already own a Spectra S1, S2 or 9+ breast pump and want a cost-effective set of spare or replacement parts that perform like OEM pieces. Its particularly useful for anyone who needs a matched pair of 21mm flanges and wants bottles with travel-friendly caps for on-the-go pumping.

Shoppers who need dome caps and silicone nipples should look elsewhere because those items are not included. Also, if you require brand-original packaging or a manufacturer warranty tied to the pump maker, consider sourcing directly from the pump manufacturer.

Pros & Cons

Pros

• Complete replacement set reduces the need to buy parts separately, saving time and cost.
• Interchangeable with Spectra pumps, so setup and fit are straightforward for existing users.
• Bottle caps with writable surface provide practical labeling for storage and daycare.

Cons

• Some customers report mixed durability of backflow protectors, so these may need replacement sooner with heavy use.

Specifications

Our Verdict

The Maymom 21mm replacement kit is a practical, cost-effective option for Spectra S1, S2 and 9+ owners who need a matched set of spare parts and prefer bottles with a rewritable cap for storage. It delivers near-OEM fit and function for most components, though users should be aware that backflow protectors may show mixed longevity under heavy use. Overall it represents good value for parents who want a ready-to-use replacement set.

Frequently Asked Questions

Are these parts compatible with my Spectra pump?
Yes, the kit is designed to be interchangeable with Spectra S1, S2 and 9+ pumps.

Does the kit include nipples or dome caps?
No, dome caps and nipples are not included in this Maymom replacement kit.

How should I clean these parts?
Parts can be cleaned with boiling water, water steam sterilizers or microwave steam bags as noted by the manufacturer.