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.

Fido Gasket | Desertcart Belgium

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€ 18.62

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

SEAL WITH CONFIDENCE - Crafted from premium BPA-free, food-safe rubber to keep your preserves fresh and safe.
TAILORED FOR YOUR FIDO JARS - Precisely sized 3.5-inch diameter guarantees an airtight, leak-resistant seal every time.
DURABILITY MEETS FLEXIBILITY - Strong yet flexible design withstands repeated use without cracking or losing shape.
ALWAYS READY ALWAYS RELIABLE - Six durable gaskets in one pack ensure you never run out when it matters most.
EASY MAINTENANCE LONG TERM USE - Hand wash recommended to preserve gasket integrity and extend lifespan.

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 and flexible gaskets ensure airtight, leak-resistant preservation for your jams, jellies, and pantry essentials. Hand wash only to maintain optimal performance and longevity.

Specifications

ASIN	B0001BMYIE
Best Sellers Rank	#30,609 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #224 in Canning Jars
Brand	Bormioli Rocco
Brand Name	Bormioli Rocco
Capacity	4.25 Fluid ounces
Closure Type	Screw-on/Threaded
Color	White
Container Shape	Round
Customer Reviews	4.7 out of 5 stars 2,534 Reviews
Food Storage Container Airtightness	Airtight
Global Trade Identification Number	00011381004808
Included Components	3.5" Replacement Rubber Gaskets (6)
Is the item dishwasher safe?	No
Is the item microwaveable?	No
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	Rubber
Material Feature	Food Grade, Freezer Safe, Reusable
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
Product Dimensions	3.5"L x 3.5"W x 0.13"H
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	6.0 Count

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€ 18.62

Duties & taxes included

In stock

Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Belgium.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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Fido Gasket

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