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ALL-SIZE Flange Inserts (10PCS)– Sizes 13/15/17/19/21mm – Compatible with 24mm Shields, BPA-Free Silicone
ALL-SIZE Flange Inserts (10PCS)– Sizes 13/15/17/19/21mm – Compatible with 24mm Shields, BPA-Free Silicone
$48.00
$78.00
38% OFF
You save $30.00
+30%
More milk
More milk with the right fit
Most mums feel the difference on their very first pump.
Why Mums Love It
Find your exact fit
Measure in seconds with the pink sizing tool, then pick the insert that matches you perfectly.
Up to 30% more milk
The right size lets your nipple move freely, so you express more in every session.
No more soreness
Soft silicone stops the rubbing and pinching, turning painful pumping into gentle comfort.
Fits any 24mm pump
Works with Relievoo, Elvie, Momcozy, Medela, Spectra and every standard 24mm flange.
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Order today, free UK delivery by soon · Tracked
Free
Returns
Returns
30-Day
Guarantee
Guarantee
FREE TODAY
Lifetime
Warranty
Warranty
What's in the Kit
Free UK shipping & fast delivery
30-day money-back guarantee
Try it at home with total peace of mind. If it's not the perfect fit, our easy UK returns mean your money back within 30 days, backed by the Consumer Rights Act 2015.
Soft, BPA-free & skin-friendly
Made from soft, food-grade BPA-free silicone that's gentle on delicate skin and simple to keep clean.
How to find your size
Measure your nipple diameter with the pink sizing tool, then choose the matching silicone insert to size your 24mm flange down to your perfect fit.
Find your perfect fit and pump in comfort. Our soft silicone flange inserts reduce the standard 24mm flange opening to your ideal size — eliminating friction, improving suction, and increasing milk output by up to 30%.
- Medical-grade silicone — ultra-soft & flexible
- 4 sizes included: 13mm, 15mm, 17mm, 19mm
- Compatible with Relievoo S32 PRO2 & most wearable pumps (24mm standard)
- Reduces nipple pain & tunnel friction
- BPA-free, easy to clean
- Includes size guide card
ALL-SIZE Flange Inserts (10PCS)– Sizes 13/15/17/19/21mm – Compatible with 24mm Shields, BPA-Free Silicone
Regular price
$48.00
Regular price
$48.00
Sale price
$78.00
Unit price
per
Every pumping mum knows this
Pumping shouldn't pinch, rub or leave you sore.
Your pump came with one flange size, 24mm, and your body was never asked. So you push through the tugging, the rubbing, the redness, and you quietly pump less milk than you should.
The truth almost no one tells you: nipples come in different sizes, and the wrong flange opening is the number one reason pumping hurts and output drops. It was never you. It was the fit.
Measure once, drop in the right insert, and pumping suddenly feels the way it always should have, comfortable and efficient.
Meet the kit that finally fits you, the Relievoo Flange Sizing Kit, measurement tool, 5 insert sizes and a cleaning brush in one box.
Why Mums Choose Relievoo
Find your perfect fit at home, backed by 2,000+ happy mums across the UK.
Find Your Exact Fit
Included measurement tool sizes you in seconds, holes from 10mm to 27mm. No more guessing.
5 Sizes Included
13, 15, 17, 19 & 21mm inserts reduce a standard 24mm shield to your ideal opening.
Up To 30% More Milk
The right fit improves latch & suction, so you express more in every session.
No More Soreness
Ultra-soft, food-grade BPA-free silicone, skin-friendly and gentle on sensitive nipples.
Easy To Clean
Cleaning brush included. Rinse, brush, air-dry, dishwasher-safe on the top rack.
Fits 24mm Shields
Works with most wearable & standard pumps, Relievoo, Elvie, Momcozy, Medela & more.
Why the Relievoo Kit Wins
| Features | Relievoo Sizing Kit | Generic Inserts | No Inserts (24mm only) |
|---|---|---|---|
| Measurement tool included | ✓ Yes | ✗ No | ✗ No |
| Number of sizes | ✓ 5 (13–21mm) | ✗ 1–2 | ✗ 0 |
| Cleaning brush included | ✓ Yes | ✗ No | ✗ No |
| Food-grade soft silicone | ✓ BPA-free | ✗ Varies | ✗ Hard plastic |
| Comfort & less soreness | ✓ Tailored fit | ✗ Hit or miss | ✗ Often painful |
| More milk output | ✓ Up to +30% | ✗ Marginal | ✗ Reduced |
| Fits 24mm shields | ✓ Universal | ✓ Some | ✓ N/A |
✨ LIMITED-TIME SALE, 38% OFF
The Right Fit Changes Everything
Comfort and More Milk, From One Tiny Insert
When your flange finally matches your nipple, the tugging stops, the redness fades, and your let-down comes easier. Mums tell us the same thing again and again, they wish they'd sized up sooner.
5Sizes
+30%More milk
BPA-freeSilicone
30-dayGuarantee
$78.00$48.00✨ SAVE $30.00
Order now →
Frequently Asked Questions
How do I know which size I need?
Use the included measurement tool. Match your nipple diameter to the closest hole (10–27mm), then choose the insert that brings your 24mm shield down to that size. It takes under a minute.
Will these fit my pump?
Yes, they fit any standard 24mm flange/shield, including most wearable and electric pumps, Relievoo, Elvie, Momcozy, Medela, Spectre and more.
What sizes are included?
13mm, 15mm, 17mm, 19mm and 21mm. Each insert reduces a standard 24mm opening to that diameter for a snug, comfortable fit.
Can the right size really increase my milk?
Yes. A correctly fitted flange improves your latch and suction seal, which helps you empty more fully, mums often see up to 30% more output after sizing down.
Are they safe and BPA-free?
Absolutely. Made from soft, food-grade BPA-free silicone, skin-friendly and gentle on sensitive nipples.
How do I clean them?
Rinse with warm soapy water and use the included cleaning brush, or pop them on the top rack of your dishwasher. Steriliser-safe and quick to air-dry.
What if they don't work for me?
30-day money-back guarantee, no questions asked, with easy UK returns. Your rights are protected under the UK Consumer Rights Act 2015.
How fast is shipping to the UK?
FREE UK shipping, fast tracked dispatch, 3 to 5 business days, UK-wide.
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