KAIYIV 18mm Flanges for Spectra S1/S2/9 Plus/Synergy Gold – Wide-Neck Pump Replacement (2 Pack)

Find your perfect fit for comfortable pumping

Choosing the right flange size can influence comfort, rhythm, and peace of mind during pumping sessions. This 18mm option is part of a set that covers 9 sizes from 13mm to 30mm, so you can experiment to locate a fit that feels natural and supportive across long days and busy schedules.

Seamless compatibility with Spectra

Designed to work with Spectra S1, S2, 9 Plus, and Synergy Gold wide-neck pumps, these flanges click in smoothly with no extra adapters. The goal is to keep your routine flowing without interruptions.

Skin-friendly and quiet

Crafted from BPA-free, food-grade plastic, the surface is smooth and gentle on the skin. The design prioritizes quiet operation, which can be appreciated during late-night sessions or work breaks.

Leak-free seal for bottles that matter

When paired with Spectra wide-neck bottles and KAIYIV bottles, the flange helps form a snug seal to minimize leaks—supporting you through hectic moments between feeds and meetings.

Easy to clean, fast rinse

The simple geometry and smooth inner walls rinse quickly, making cleanup faster between tasks or after a late-night pump.

Lightweight and portable

Compact and travel-friendly, this two-pack is ideal for your pump bag, car, or office—so you’re prepared on your busiest days.

What you get

• Two 18mm flanges from a trusted third-party maker, compatible with Spectra wide-neck systems
• Wide-neck compatibility with a secure seal
• Durable, easy to sanitize for daily reuse

Care and quick tips

• Rinse with warm water after pumping and air-dry completely
• Sanitize regularly according to your routine
• Store in a clean, dry place to extend lifespan

Note: These are not original Spectra parts, but they’re designed to align with the same system for convenience.