These replacement jar seals are handy to keep around, so you're never caught out without a seal after making a batch of preserve. Our range of Kilner jars and accessories have everything you need to start preserving. Join the growing trend of making your own jams and preserves with these durable jars and handy accessories with a quality you can trust. These quality seals will ensure an airtight seal on the Kilner ? Round and Square Clip Top Jars in the following size: 3L / 3000ml.