{
  "schema_version": "compare-page.v2",
  "page_id": "choosing-a-willow-breast-pump-flange-size",
  "url": "https://robotrunk.com/compare/want/choosing-a-willow-breast-pump-flange-size",
  "title": "Choosing a Willow breast pump flange size",
  "question": "How to choose the right flange size for a Willow breast pump.",
  "answer": "Willow Pump Willow Sizing Insert Set: They are designed for the perfect fit and performance with Willow and make pumping more comfortable for mamas with smaller flange sizes. Sizes offered are 13mm, 15mm, 17mm, 19mm, 21mm and 27mm. Willow Pump Willow Sync Flange Set 24mm (2-pack): The flanges are 24mm. Designed for Willow Sync pumps. Willow Pump Wave 2-in-1 Double Manual Wearable Breast Pump + Cups: It includes a soft 24 mm silicone flange. The checked facts do not explain how to measure for a flange size.",
  "kind": "breastfeeding supply",
  "market": "US",
  "generated_at": "2026-10-16T21:57:56.466Z",
  "columns": [
    "Flange size",
    "Pack size",
    "Compatibility"
  ],
  "notices": {
    "facts": "Every value in the table is a fact RoboTrunk checked, linked to the page it came from. A dash means no checked fact fills that cell.",
    "price": "Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live."
  },
  "cited_facts": [
    {
      "ref": "p1.f1",
      "product": "Willow Pump Willow Sizing Insert Set",
      "field": "Pack size",
      "value": "The sizing inserts come as a 2-pack.",
      "stated_as": "2-pack",
      "source_type": "listing",
      "source_url": "https://willowpump.myshopify.com/products.json",
      "source_read_at": "2026-10-11T07:27:24.617Z"
    },
    {
      "ref": "p1.f2",
      "product": "Willow Pump Willow Sizing Insert Set",
      "field": "Purpose",
      "value": "They are designed for the perfect fit and performance with Willow and make pumping more comfortable for mamas with smaller flange sizes.",
      "stated_as": "Designed for the perfect fit and performance with Willow, Sizing Inserts make pumping more comfortable for mamas with smaller flange sizes.",
      "source_type": "listing",
      "source_url": "https://willowpump.myshopify.com/products.json",
      "source_read_at": "2026-10-11T07:27:24.617Z"
    },
    {
      "ref": "p1.f3",
      "product": "Willow Pump Willow Sizing Insert Set",
      "field": "Available sizes",
      "value": "Sizes offered are 13mm, 15mm, 17mm, 19mm, 21mm and 27mm.",
      "stated_as": "Variant: 27mm | 10.99 USD | SKU S827",
      "source_type": "listing",
      "source_url": "https://willowpump.myshopify.com/products.json",
      "source_read_at": "2026-10-11T07:27:24.617Z"
    },
    {
      "ref": "p2.f1",
      "product": "Willow Pump Willow Sync Flange Set 24mm (2-pack)",
      "field": "pack size",
      "value": "Sold as a 2-pack.",
      "stated_as": "Willow Sync Flange Set 24mm (2-pack)",
      "source_type": "listing",
      "source_url": "https://willowpump.myshopify.com/products.json",
      "source_read_at": "2026-10-11T07:27:24.617Z"
    },
    {
      "ref": "p2.f2",
      "product": "Willow Pump Willow Sync Flange Set 24mm (2-pack)",
      "field": "flange size",
      "value": "The flanges are 24mm.",
      "stated_as": "Willow Sync Flange Set 24mm (2-pack)",
      "source_type": "listing",
      "source_url": "https://willowpump.myshopify.com/products.json",
      "source_read_at": "2026-10-11T07:27:24.617Z"
    },
    {
      "ref": "p2.f4",
      "product": "Willow Pump Willow Sync Flange Set 24mm (2-pack)",
      "field": "compatibility",
      "value": "Designed for Willow Sync pumps.",
      "stated_as": "Willow Sync Flange Set 24mm (2-pack)",
      "source_type": "listing",
      "source_url": "https://willowpump.myshopify.com/products.json",
      "source_read_at": "2026-10-11T07:27:24.617Z"
    },
    {
      "ref": "p3.f4",
      "product": "Willow Pump Wave 2-in-1 Double Manual Wearable Breast Pump + Cups",
      "field": "compatibility",
      "value": "It connects to traditional breast pumps for flexible pumping options.",
      "stated_as": "It connects to traditional breast pumps for flexible pumping options",
      "source_type": "listing",
      "source_url": "https://willowpump.myshopify.com/products.json",
      "source_read_at": "2026-10-11T07:27:24.617Z"
    },
    {
      "ref": "p3.f5",
      "product": "Willow Pump Wave 2-in-1 Double Manual Wearable Breast Pump + Cups",
      "field": "flange",
      "value": "It includes a soft 24 mm silicone flange.",
      "stated_as": "includes a soft 24 mm silicone flange",
      "source_type": "listing",
      "source_url": "https://willowpump.myshopify.com/products.json",
      "source_read_at": "2026-10-11T07:27:24.617Z"
    }
  ],
  "rows": [
    {
      "rank": 1,
      "merchant": {
        "slug": "onewillow-com",
        "display_name": "onewillow.com"
      },
      "product_id": "gid://shopify/Product/6552686755933",
      "name": "Willow Pump Willow Sizing Insert Set",
      "url": "/products/ucp/onewillow-com/6552686755933",
      "why": "They are designed for the perfect fit and performance with Willow and make pumping more comfortable for mamas with smaller flange sizes.",
      "cells": [
        {
          "column": "Flange size",
          "fact": {
            "field": "Available sizes",
            "value": "Sizes offered are 13mm, 15mm, 17mm, 19mm, 21mm and 27mm.",
            "stated_as": "Variant: 27mm | 10.99 USD | SKU S827",
            "source_type": "listing",
            "source_url": "https://willowpump.myshopify.com/products.json",
            "source_read_at": "2026-10-11T07:27:24.617Z"
          }
        },
        {
          "column": "Pack size",
          "fact": {
            "field": "Pack size",
            "value": "The sizing inserts come as a 2-pack.",
            "stated_as": "2-pack",
            "source_type": "listing",
            "source_url": "https://willowpump.myshopify.com/products.json",
            "source_read_at": "2026-10-11T07:27:24.617Z"
          }
        },
        {
          "column": "Compatibility",
          "fact": null
        }
      ]
    },
    {
      "rank": 2,
      "merchant": {
        "slug": "onewillow-com",
        "display_name": "onewillow.com"
      },
      "product_id": "gid://shopify/Product/7967832408157",
      "name": "Willow Pump Willow Sync Flange Set 24mm (2-pack)",
      "url": "/products/ucp/onewillow-com/7967832408157",
      "why": "The flanges are 24mm.",
      "cells": [
        {
          "column": "Flange size",
          "fact": {
            "field": "flange size",
            "value": "The flanges are 24mm.",
            "stated_as": "Willow Sync Flange Set 24mm (2-pack)",
            "source_type": "listing",
            "source_url": "https://willowpump.myshopify.com/products.json",
            "source_read_at": "2026-10-11T07:27:24.617Z"
          }
        },
        {
          "column": "Pack size",
          "fact": {
            "field": "pack size",
            "value": "Sold as a 2-pack.",
            "stated_as": "Willow Sync Flange Set 24mm (2-pack)",
            "source_type": "listing",
            "source_url": "https://willowpump.myshopify.com/products.json",
            "source_read_at": "2026-10-11T07:27:24.617Z"
          }
        },
        {
          "column": "Compatibility",
          "fact": {
            "field": "compatibility",
            "value": "Designed for Willow Sync pumps.",
            "stated_as": "Willow Sync Flange Set 24mm (2-pack)",
            "source_type": "listing",
            "source_url": "https://willowpump.myshopify.com/products.json",
            "source_read_at": "2026-10-11T07:27:24.617Z"
          }
        }
      ]
    },
    {
      "rank": 3,
      "merchant": {
        "slug": "onewillow-com",
        "display_name": "onewillow.com"
      },
      "product_id": "gid://shopify/Product/8010767794269",
      "name": "Willow Pump Wave 2-in-1 Double Manual Wearable Breast Pump + Cups",
      "url": "/products/ucp/onewillow-com/8010767794269",
      "why": "It includes a soft 24 mm silicone flange.",
      "cells": [
        {
          "column": "Flange size",
          "fact": {
            "field": "flange",
            "value": "It includes a soft 24 mm silicone flange.",
            "stated_as": "includes a soft 24 mm silicone flange",
            "source_type": "listing",
            "source_url": "https://willowpump.myshopify.com/products.json",
            "source_read_at": "2026-10-11T07:27:24.617Z"
          }
        },
        {
          "column": "Pack size",
          "fact": null
        },
        {
          "column": "Compatibility",
          "fact": {
            "field": "compatibility",
            "value": "It connects to traditional breast pumps for flexible pumping options.",
            "stated_as": "It connects to traditional breast pumps for flexible pumping options",
            "source_type": "listing",
            "source_url": "https://willowpump.myshopify.com/products.json",
            "source_read_at": "2026-10-11T07:27:24.617Z"
          }
        }
      ]
    }
  ]
}