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

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

Product ID: 1368823

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Details

Brand
Bormioli Rocco
Color
White
Material
Glass
Material Feature
BPA Free Food
Capacity
4.25 Fluid

♻️Durable, flexible rubber

❄️Freezer safe to -20°C

🛡️Leakproof seal

Description

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

FREEZER READY SEAL - Keeps your preserves secure even at -4°F (-20°C) for versatile storage.
FOOD GRADE BPA FREE - Safe, non-toxic rubber ensures your food stays pure and fresh.
SET OF 6 FOR CONVENIENCE - Always have a spare gasket ready—never lose your seal again.
PERFECT FIT FOR FIDO JARS - Seamlessly compatible 3.5’’ diameter gasket for airtight preservation.
MICROWAVE DISHWASHER SAFE - Effortless cleaning and reheating without compromising gasket integrity.

Bormioli Rocco Replacement Gaskets are premium food-grade rubber seals designed exclusively for Fido jars, ensuring a leakproof, airtight fit. This set of six durable, BPA-free gaskets supports freezer storage down to -20°C and is both microwave and dishwasher safe, making them an essential upgrade for millennial professionals who value convenience, sustainability, and flawless food preservation.

Specifications

Material Type Free	All Other Materials Free
Is the item microwaveable?	Yes
Product Care Instructions	Hand Wash Only
Material Features	BPA Free, Food Grade
Is the item dishwasher safe?	Yes
Material Type	Rubber
Closure Type	Screw-on/Threaded
Additional Features	Microwave Safe
Container Shape	Round
Color	White
Item Weight	22.68 g
Unit Count	6.0 Count
Item Volume	4.25 Fluid Ounces
Package Quantity	1
Capacity	4.25 Fluid Ounces

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