Why Is My Kilner Push Top Jar Not Sealing? Quick Fixes
By Kilner® - Iconic Glass Jars, Bottles & Equipment | Kilner® | Published: 2026-10-22
Category: Tips & Care
If your Kilner push top jar isn't sealing, the fix is often simple. This guide covers common causes and step-by-step solutions to restore an airtight seal.
Quick answer
A Kilner push top jar that won't seal usually has a dirty or misaligned gasket, debris on the rim, or a warped lid. Clean the gasket and rim, check alignment, and test the seal again.
Common causes of seal failure
The push top mechanism relies on a flexible silicone or rubber gasket pressing against the glass rim. If the gasket is dirty, twisted, or worn out, air can leak in. Food residue or grease on the rim also breaks the seal. In rare cases, the glass rim may have a chip or the lid may be bent from over-tightening or dropping.
A jar that fails to seal after cleaning and realignment likely has a damaged gasket or lid. Replacement gaskets are available for some models, but if the glass rim is chipped, the jar itself needs replacing.
Step-by-step diagnosis and fix
- Symptom: The push top lid does not click down firmly, or air escapes when you press the center button.
- Likely cause: The gasket is dirty, misaligned, or worn. The glass rim may have debris or a small chip.
- Corrective action: Remove the gasket and wash it with warm soapy water. Wipe the glass rim clean. Reinstall the gasket flat and centered. Press the lid down evenly. If it still fails, inspect the gasket for cracks or permanent flattening and replace it if needed. After cleaning, test the seal by pressing the center button. If it stays down, the fix worked.
- Stop or choose another option: If the jar still does not seal after a new gasket, check the glass rim for chips or cracks. A damaged rim cannot form an airtight seal, and the jar should be replaced. Do not use a jar with a chipped rim for food storage. Discard or repurpose the jar for non-food use if the rim is damaged.
Product facts
- Set of 3 Kilner® 0.85 Litre Universal Push Top Jars: Discover the Kilner® 0.85 Litre Universal Push Top Jars, ideal for storing dry goods, snacks, and more. This versatile jar features a secure push top lid and durable glass construction. The push top lid design relies on a clean, undamaged gasket and rim to create an airtight seal, making proper maintenance essential for long-term use.
Set of 3 Kilner® 0.85 Litre Universal Push Top Jars
