Quick Facts
Spectra Wide Neck Breast Flange Kit is a replacement single pumping part set for Spectra S1, S2, SG, and 9 Plus breast pumps.
Best for
Owners of Spectra S1, S2, SG, or 9 Plus pumps.
Key detail
BPA and DEHP free materials
Size and fit
Flange sizes: 16mm, 20mm, 24mm, 28mm, 32mm
Consider if
Consider buying an extra set if you double pump.
Shipping
Free US shipping over $100, 30-day returns
Keep Your Spectra Pump Working Like New
Replacement closed system parts to maintain suction, prevent contamination, and keep pumping at home or work.
Keep Your Spectra Pump Working Like New
Precise Fit for Better Suction
Precise Fit for Better Suction

Available in 16 mm through 32 mm sizes to help you find a snug, comfortable fit. Correct flange sizing supports consistent suction and more efficient pumping.

Backflow Protection Included
Backflow Protection Included

Includes a backflow protector and duckbill valve, crucial components for Spectra closed system pumps. These parts help prevent milk from reaching the pump motor.

Pump-Safe, Easy to Replace
Pump-Safe, Easy to Replace

Made from BPA and DEHP free materials and backed by a 90 day limited parts warranty. Keep an extra set at work or in your pump bag to avoid interruptions.

Closed System Protection
Includes backflow protector and duckbill valve to reduce risk of milk contamination.
Multiple Flange Sizes
Choose from 16 mm to 32 mm flange sizes for a better, more comfortable fit.
BPA and DEHP Free
Made with pump-safe materials so milk stays free from harmful chemicals.
Single-Set Convenience
Sold as a single pumping flange set, easy to stash at home or work.
How to Choose a Flange Size

The right flange size makes pumping more comfortable and helps maintain milk supply.

  1. Measure Your Nipple: Measure the nipple, not the areola, to find a starting flange size. Many brands list sizes in millimeters for comparison.
  2. Use a Fit Test: Try pumping for a short session to check comfort. Your nipple should move freely without rubbing or pinching.
  3. Signs It’s Too Small: Pain, pinching, or compressed nipple tissue during pumping usually means a flange is too small.
  4. Signs It’s Too Large: Excess areola pulled into the tunnel or poor suction can mean the flange is too large.
  5. When to Replace Parts: Replace pump parts every three to six months or sooner if valves or tubing show wear, to maintain performance.
Frequently Asked Questions
Which Spectra pumps is this kit compatible with?

This single flange kit fits Spectra S1, S2, SG, and 9 Plus single pumping models.

Can I use this kit for double pumping?

This listing is for one single pumping flange set. For double pumping, purchase a second flange set.

How often should I replace these parts?

We recommend replacing pump parts every 3 to 6 months for optimal suction and hygiene.

How should I clean these parts?

Rinse and wash parts with warm, soapy water after use, then air dry. Follow your Spectra manual for any sterilization guidance.

What warranty covers this kit?

A 90 day limited manufacturer’s parts warranty is included with this kit.

What are your shipping and return policies?

We ship from a US warehouse, offer free US shipping on orders over $100, and accept returns within 30 days. Human customer support is available if you need help.

From the Moogco Baby Journal
A New Mom’s Guide to Breast Pumping Supplies
By Eda Ulger , Moogco Baby Editor and mom of two · Updated May 2026 So, you’re diving into the world of pumping! It can feel like you’re suddenly trying to learn a new language made up of flanges, valves, and...
Read the guide →
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