---
product_id: 193836008
title: "Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve"
brand: "maymom"
price: "$42.76"
currency: USD
in_stock: true
reviews_count: 13
category: "Maymom"
url: https://www.desertcart.us/products/193836008-maymom-21mm-flange-and-duckbill-valve-compatible-with-spectra-s1
store_origin: US
region: United States of America
---

# 21mm precision flange size 100% Spectra-compatible interchangeability BPA/DEHP free, FDA compliant safety Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve

**Brand:** maymom
**Price:** $42.76
**Availability:** ✅ In Stock

## Summary

> 🍼 Upgrade your pump game with Maymom’s flawless fit & durability—because your flow deserves the best!

## Quick Answers

- **What is this?** Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve by maymom
- **How much does it cost?** $42.76 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/193836008-maymom-21mm-flange-and-duckbill-valve-compatible-with-spectra-s1)

## Best For

- maymom enthusiasts

## Why This Product

- Trusted maymom brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Enhanced Usability:** Duckbill valves designed for easy plug-in and removal, reducing hassle during busy pumping routines.
- • **Perfect Fit, Zero Guesswork:** Engineered for seamless compatibility with Spectra S1, S2, and S1Plus pumps—swap parts effortlessly without missing a beat.
- • **Durability Meets Convenience:** Made from premium materials that withstand boiling, steaming, and dishwasher top rack cleaning—built to last through countless pumping sessions.
- • **Safe & Certified Peace of Mind:** BPA/DEHP free and FDA compliant, independently lab-tested to ensure the highest safety standards for you and your baby.
- • **Wide Compatibility with Bottles:** Works flawlessly with Spectra wide-neck, Avant, and Maymom wide-mouth bottles—flexibility that fits your lifestyle.

## Overview

The Maymom 21mm Flange and Duckbill Valve set offers a premium, non-OEM replacement compatible with Spectra S1, S2, and S1Plus breast pumps. Engineered for perfect interchangeability, these parts deliver the same suction performance as original Spectra components. Crafted from durable, BPA/DEHP-free materials, they withstand rigorous cleaning methods including boiling and steaming. Designed for easy installation and removal, the valves and flanges also fit multiple wide-neck bottle brands, making this set a versatile, safe, and reliable choice for modern breastfeeding moms.

## Description

desertcart.com : Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve : Baby

Review: Best replacement parts for my Spectra S2 - These replacement parts for my Spectra S2 were exactly what I needed! The set comes with clear instructions and images, which made swapping everything out super simple, even for someone like me who usually finds pump parts confusing. I especially appreciated the QR codes included; they linked directly to step-by-step instructions and even to individual replacement parts if I ever need to reorder just one piece. The parts themselves feel durable and well-made, and they fit my S2 perfectly without any issues. Everything works smoothly and has held up well after multiple uses and washes. It’s such a relief to have a compatible, high-quality option that makes pumping easier and less stressful. Highly recommend for any Spectra S2 user who wants reliable replacement parts without the guesswork!
Review: A must have! - This kit saved me! The duckbills work great with the manufacturer’s parts for my spectra pump. These pieces can be used interchangeably with the original pieces from my pump, there is no noticeable difference. I would recommend always having this set on hand, as it is easy for pump pieces to go missing. It is easy to clean and good quality, with stands the heat of steaming.

## Features

- CONTENTS: 2ct Small 21mm flanges and 2ct duckbill valves compatible with Spectra S2, Spectra S1 and Spectra S1Plus breastpump. Made by Maymom. Not Original Spectra Flanges, Spectra Duckbill Valve. Can use Maymom flange for Spectra S2 pump parts or Maymom valve for Spectra valve replacement. Made by Maymom, not by original spectra company. Maymom is not affiliated with Uzinmedicare, the trademark owner of spectra.
- COMPATIBLE AND INTERCHANGEABLE with Spectra pump parts. Maymom pump parts perform the same suction power as OEM parts, Spectra S2 pump parts, Spectra S1Plus accessories.
- MAYMOM FLANGE can work with Spectra wide-neck bottle (wide-mouth bottle), Avant bottle, and Maymom widemouth bottle. Available Flange sizes:13mm, 15mm, 17mm, 19mm, 21mm, 24mm, 25mm, 27mm, 28mm, 29mm, 30mm, 32mm.
- MAYMOM DUCKBILL VALVES features "easier to plug in and remove", "durable quality" and "color options"
- BPA/DEHP FREE. FDA compliant for food contacts. Tested by independent lab. Test report online available for reference. Products in retail pack sealed by manufacturer. No problem with dishwasher top rack, water steam cleaning, boiling water or microwave-steam bags.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN  | B0863NBHRX |
| Best Sellers Rank | #1,559 in Baby ( See Top 100 in Baby ) #83 in Breastfeeding Supplies |
| Customer Reviews | 4.6 4.6 out of 5 stars (5,771) |
| Date First Available  | March 19, 2020 |
| Item model number  | S012W-FxxDx2 |
| Manufacturer  | Maymom |
| Manufacturer recommended age  | 0 - 3 years |
| Product Dimensions  | 5.51 x 2.36 x 6.69 inches; 2.82 ounces |

## Product Details

- **Brand:** Maymom
- **Color:** White Valve
- **Included Components:** Breast Flange, Valve
- **Material:** Plastic, Silicone
- **Special Feature:** Closed System

## Images

![Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 S2 9 Plus Replacment Pump Parts Not Original Spectra Flange Duckbill Valve - Image 1](https://m.media-amazon.com/images/I/81wbohX86oL.jpg)

## Questions & Answers

**Q: will this work with bellababy?**
A: no.  for bellabay, please buy from the following 
https://www.amazon.com/Maymom-Compatible-Bellababy-Double-Electric/dp/B09W2KRSC5/ref=sr_1_2?crid=23GCK9QCNBTGZ&keywords=maymom%2Bbellababy&qid=1676120494&sprefix=maymom%2Bbella%2Caps%2C298&sr=8-2&th=1

**Q: Did anyone have trouble and feel like these ran big?**
A: Yes I definitely felt these ran big as compared to standard spectra. It doesn’t make sense but 19mm was too big when it was the right size in spectra

**Q: I used mine before realizing it’s the wrong flange size, should I still return them?**
A: I did the same thing. I just brought flange inserts that were my nipple size and just pushed it in for the correct sizing. But you can if you want.

**Q: Does this flange work with the Kiinde system?**
A: Yes if you have the Kiinde adapters

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best replacement parts for my Spectra S2
*by C***R on August 29, 2025*

These replacement parts for my Spectra S2 were exactly what I needed! The set comes with clear instructions and images, which made swapping everything out super simple, even for someone like me who usually finds pump parts confusing. I especially appreciated the QR codes included; they linked directly to step-by-step instructions and even to individual replacement parts if I ever need to reorder just one piece. The parts themselves feel durable and well-made, and they fit my S2 perfectly without any issues. Everything works smoothly and has held up well after multiple uses and washes. It’s such a relief to have a compatible, high-quality option that makes pumping easier and less stressful. Highly recommend for any Spectra S2 user who wants reliable replacement parts without the guesswork!

### ⭐⭐⭐⭐⭐ A must have!
*by A***R on January 24, 2026*

This kit saved me! The duckbills work great with the manufacturer’s parts for my spectra pump. These pieces can be used interchangeably with the original pieces from my pump, there is no noticeable difference. I would recommend always having this set on hand, as it is easy for pump pieces to go missing. It is easy to clean and good quality, with stands the heat of steaming.

### ⭐⭐⭐⭐⭐ Highly recommend
*by A***O on January 24, 2026*

This flange and valve set was a total game changer during my breastfeeding journey. I loved having a wide range of different flange sizes to try—being able to find the right fit made such a huge difference in comfort and output. It really helped take the guesswork out of pumping. The standard flanges that come with most breast pumps simply don’t work for the average female, and this set finally addressed that gap. Better fit, less discomfort, and a much more positive experience overall. I truly wish I had found these sooner. Highly recommend to anyone pumping or breastfeeding!

## Frequently Bought Together

- Maymom 21mm Flange and Duckbill Valve Compatible with Spectra S1 Spectra S2 Spectra 9 Plus Not Original Spectra 20mm Replace Pump Parts Spectra Flange Spectra Duckbill Valve
- Spectra - Wide Neck Baby Bottles - Compatible with Spectra Breast Milk Pump Flanges (Pack of 2)
- Momcozy Hands Free Pumping Bra, Adjustable Breast-Pumps Holding and Nursing Bra, Pumping & Nursing Bra in One

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-11*