what is the inside diameter

The inside diameter is 2 11/16. The outside diameter is 3 9/16. I measured this March 24, 2021'

do you have 5 outside 4 inside?

Try "Sur La Table Le Parfait Rubber Gaskets 612491 , 100mm" -- I am not sure this is what you are looking for, but I needed a larger gasket and found these that are bigger than the Fido ones. These DO fit my larger jar lid/mouth (~4 1/2" outside and 3 1/2" inside), so I am quite pleased to have both sizes now for my storage jars. There are 12 in a pack: Sur La Table Le Parfait Rubber Gaskets 612491 , 100mm

I need a gasket 4 1/2" outside and 3 1/2 " inside...do U have this? Thank you...where do I find this size gasket?

Try "Sur La Table Le Parfait Rubber Gaskets 612491 , 100mm" -- I am not sure this is what you are looking for, but I needed a larger gasket and found these that are bigger than the Fido ones. These DO fit my larger jar lid/mouth (~4 1/2" outside and 3 1/2" inside), so I am quite pleased to have both sizes now for my storage jars. There are 12 in a pack: Sur La Table Le Parfait Rubber Gaskets 612491 , 100mm

Can these be used for canning?

Depends on what country you are from ;) In Europe, they are widely used for canning.

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Replacement Rubber Gaskets for Fido Jars, 3.5" Size, Pack of 6

Product ID: 1368823

Details

Brand
Bormioli Rocco
Capacity
4.25 fluid
Color
White
Material
Rubber
Material Feature
Food Grade

🔄Pack of 6 for constant readiness

🧩Perfect 3.5” fit for Fido jars

🛡️BPA-free food-grade rubber

5.49 OMR

Duties & taxes included

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Description

🔒 Lock in freshness, unlock your kitchen’s potential!

TAILORED FOR FIDO - Precisely sized 3.5-inch diameter guarantees a flawless fit for your Bormioli Rocco Fido jars, no guesswork needed.
SAFE SUSTAINABLE - Crafted from BPA-free, food-grade rubber that’s flexible, strong, and reusable—perfect for eco-conscious kitchen pros.
EASY CARE LONG LIFE - Hand wash only to maintain gasket integrity and extend the lifespan of your essential kitchen seals.
SEAL WITH CONFIDENCE - Engineered for airtight, leak-resistant preservation to keep your homemade goods fresh and flavorful.
ALWAYS READY ALWAYS RELIABLE - Six durable gaskets in one pack ensure you never run out when it’s time to seal your culinary creations.

Bormioli Rocco Replacement Rubber Gaskets are premium, BPA-free food-grade seals designed specifically for 3.5-inch Fido jars. Sold in convenient packs of six, these durable, flexible gaskets ensure airtight, leak-resistant storage for jams, preserves, and more—keeping your homemade creations fresh and ready to impress.

Specifications

ASIN	B0001BMYIE
Best Sellers Rank	#28,726 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #213 in Canning Jars
Brand Name	Bormioli Rocco
Capacity	4.25 fluid ounces
Closure Type	Screw-on/Threaded
Color	White
Container Shape	Round
Customer Reviews	4.7 4.7 out of 5 stars (2,536)
Food Storage Container Airtightness	Airtight
Global Trade Identification Number	00011381004808
Included Components	3.5" Replacement Rubber Gaskets (6)
Item Dimensions L x W x H	3.5"L x 3.5"W x 0.13"H
Item Form	Jar
Item Type Name	Replacement Rubber Gaskets
Item Volume	4.25 fluid ounces
Item Weight	13.61 g
Manufacturer	Bormioli Rocco
Material Features	Food Grade, Freezer Safe, Reusable
Material Type	Rubber
Material Type Free	BPA Free
Other Special Features of the Product	Air Tight, Durable, Leak Resistant
Package Quantity	1
Product Care Instructions	Hand Wash Only
Recommended Uses For Product	Candy, Jam, Jelly Preserves, Pasta, Rice
Size	3.5" Size
Specific Uses For Product	Canning, Household
UPC	798837536020 011381004808 785739010666 798527083964 885860769652 885641570996
Unit Count	6 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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