Flange Sizing Kit Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
Flange Sizing Kit sales on Amazon US totaled 61,050 units in July 2026 (▼ 1.2% vs. the prior month), generating an estimated $1,339,676 in revenue across the 50 top-ranked ASINs for this search term. Demand is heavily concentrated at the top of the ranking — the ten best performers capture 81.9% of unit volume and 84.9% of revenue, while a typical listing is priced at $25.43. The keyword itself pulled 40,595 Amazon queries over the same period (▼ 0.4% MoM).
Zooming out to the 12-month window ending July 2026, the flange sizing kit Top 50 moved 629,350 units and $9,008,086 in cumulative sales — an average of 52,446 units and $750,674 per month. Monthly throughput topped out at 62,950 units in August 2025 and dipped to 36,850 in May 2026, leaving the latest reading 3.0% lower than August 2025.
Flange Sizing Kit Sales Trend (Trailing 12 Months)
Based on the top 50 ASINs by monthly sales for this keyword
2025/08
2025/09
2025/10
2025/11
2025/12
2026/01
2026/02
2026/03
2026/04
2026/05
2026/06
2026/07
Monthly Sales 2026/07
61K
▼ 1.2% MoM
Monthly Revenue 2026/07
$1.3M
▲ 45.8% MoM
Top 10 Market Share 2026/07
81.9%
Flange Sizing Kit Market Share & Sales Concentration on Amazon US — July 2026
The most-sold flange sizing kit listing on Amazon US in July 2026 is ASIN B07CWK4S5W (Brand: haakaa), which sold 10,000 units at $12.94 apiece — equal to 16.4% of every unit tracked in this report.
The Top 10 ASINs account for 50,000 units and $1,137,630 in July 2026 — 81.9% of unit volume and 84.9% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for 'Flange Sizing Kit' on Amazon
July 2026
Is 81.9% Top 10 share highly concentrated?
Ask AI to evaluate competition, market structure, and entry opportunities using ’s tracked Amazon sales, ranking, and keyword data.
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Top 5 Volume Share breakdown
B07CWK4S5W
haakaa Manual Breast Pump for Breastfeeding 4oz/100ml | Natural Suction, One-Piece Easy-Clean Design, Quiet & Cord-Free, Premium Silicone, Portable, BPA/PVC/Phthalate-Free
10K
▲ 0.0%vs. prior month
$129.4K
latest month
12-month trend
B0CMPBBHMZ
Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump | Compatible with Spectra, Includes Nipple Sizer for Flanges for Accurate Sizing, Boosts Pumping Efficiency & Comfort, BPA-free
10K
▲ 0.0%vs. prior month
$99.9K
latest month
12-month trend
B0BYB2C15M
Legendairy Milk Organic Pumping Spray, Lanolin-Free Breast Lubricant, 4 oz | USDA Organic Pumping Spray with Coconut and Olive Oils. Reduces Friction Between Skin and Pump Flanges For Smoother Pumping
7K
▼ 22.2%vs. prior month
$181.9K
latest month
12-month trend
B0CKZH37FX
Nursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS | 13/15/17/19/21mm, Includes Nipple Sizer for Flanges to Find the Right Fit, Soft Silicone for Comfortable & Efficient Pumping
7K
▼ 12.5%vs. prior month
$69.9K
latest month
12-month trend
B0CY81WHD5
Nursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS | 13/15/17/19/21mm Flange Inserts, Nipple Measurement Tool, Fit Electric & Manual Pumps, Soft Silicone, Comfortable Pumping
6K
▲ 0.0%vs. prior month
$59.9K
latest month
12-month trend
B08MWQQN6W
Legendairy Milk Duckbill Valves for Spectra Breast Pumps, 6 Ct, BPA-Free | Pink food-grade silicone valves with pull tabs fit Spectra, Medela, Motif, BabyBuddha & Zomee; easy to clean, strong suction.
4K
▲ 33.3%vs. prior month
$52K
latest month
12-month trend
Unlock to view all Top 50 ASIN competitors and their sales contributions
Best Flange Sizing Kit Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
Nursi Luna is the best-performing flange sizing kit brand in July 2026, moving 13,000 units across 2 ASINs for 26.0% of Top 10 volume. Legendairy Milk follows with 11,000 units (22.0%), ahead of haakaa on 10,000 units (20.0%).
With 8 brands splitting the Top 10 and 68.0% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $9.99 to $19.49, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
Nursi Luna
2 ASINs in Top 10
26.0%
Units
13K
Revenue
$129.9K
Avg. price
$9.99
B0CKZH37FX
$9.99·★4.5·2.2K revsNursi Luna Flange Sizing Kit, Flange Inserts for 24mm Breast Pumps, 10PCS | 13/15/17/19/21mm, Includes Nipple Sizer for Flanges to Find the Right Fit, Soft Silicone for Comfortable & Efficient Pumping
Units sold7KB0CY81WHD5
$9.99·★4.6·2.2K revsNursi Luna Flange Sizing Kit for 24mm Breast Pumps, 10PCS | 13/15/17/19/21mm Flange Inserts, Nipple Measurement Tool, Fit Electric & Manual Pumps, Soft Silicone, Comfortable Pumping
Units sold6K
Legendairy Milk
2 ASINs in Top 10
22.0%
Units
11K
Revenue
$233.9K
Avg. price
$19.49
B0BYB2C15M
$25.99·★4.5·1.6K revsLegendairy Milk Organic Pumping Spray, Lanolin-Free Breast Lubricant, 4 oz | USDA Organic Pumping Spray with Coconut and Olive Oils. Reduces Friction Between Skin and Pump Flanges For Smoother Pumping
Units sold7KB08MWQQN6W
$12.99·★4.4·1.7K revsLegendairy Milk Duckbill Valves for Spectra Breast Pumps, 6 Ct, BPA-Free | Pink food-grade silicone valves with pull tabs fit Spectra, Medela, Motif, BabyBuddha & Zomee; easy to clean, strong suction.
Units sold4K
haakaa
1 ASIN in Top 10
20.0%
Units
10K
Revenue
$129.4K
Avg. price
$12.94
B07CWK4S5W
$12.94·★4.6·96K revshaakaa Manual Breast Pump for Breastfeeding 4oz/100ml | Natural Suction, One-Piece Easy-Clean Design, Quiet & Cord-Free, Premium Silicone, Portable, BPA/PVC/Phthalate-Free
Units sold10K
Trending Flange Sizing Kit Products — Growth Leaders & New Top 10 Entrants
Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B0H397M824 booked 1K units at $449.99. On the growth side, B0GTTWW3V4 leads positive momentum with ▲ 300.0% MoM growth on 200 units, with B0DGQLY8JM close behind at ▲ 200.0% MoM on 600 units.
The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.
B0H397M824
eufy Heated Massage Wearable Breast Pump S2 Pro, Charging Case | HeatFlow 2.0, VibraPump Massage, Nipple Light, Full Milk Alert, 7-Day Battery, App DIY Rhythm, Double-Sealed Flange
Price
$449.99
Rating
4.2
Reviews
4.1K
Latest month sales
B0GTTWW3V4
Wearable Breast Pump ABP-1308 | SPA-Level Comfort 3 Modes & 9 Levels | Wearable Breastfeeding Pump, Low-Noise Electric Breast Pump Portable for Office & Home Use (27mm Shield, 21/24mm Flange)
Price
$27.99
Rating
3.4
Reviews
31
Latest month sales
B0DGQLY8JM
Nuliie Silicone Flange Inserts 13/15/17/19/21mm 10PCS for 24mm Breast Pump | Compatible with Spectra, Includes Nipple Sizer for Flanges, Storage case, Tape Measure and Cleaning Brush for Easy Pumping
Unlock to view ASIN details and product titles
Price
$13.99
Rating
4.5
Reviews
478
Latest month sales
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