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11
Before Beginning
Selecting Jars
Glass home canning jars, also known as Mason jars, are made of heat-tempered
glass for durability and reuse. These are the only jars recommended for safe
home canning.
They are available in several standard size jars: 250 ml, 500 ml, and 1 litre.
They will withstand the heat of a pressure canner. The diameter of Mason jars
may vary from one manufacturer to another.
Before filling the Mason jars, test load your canner. It may be necessary to
double-deck 500 ml and 250 ml jars to reach the maximum capacity of your
canner, as indicated in the chart below.
To double-deck, stagger the jars by placing one jar on top of two. However,
if using the boiling water method, do not double-deck the jars. The jars may
touch. The canning rack which accompanied your canner must be placed on the
bottom of the canner to prevent jar breakage.
Although it is not necessary to use a canning rack between layers of jars, if you
wish to do so, it can be ordered from the Presto Consumer Service Department
(page 77).
Maximum Jar Capacities
Jar Size
Regular Mouth
Wide Mouth
250 ml
26 jars*
16 jars*
500 ml
20 jars*
16 jars*
1 litre
7 jars
7 jars
Canning Lids and Bands
The two-piece vacuum cap is the recommended closure for home canning. It
consists of a flat metal lid with a sealing compound on the outer edge and a
separate metal screw band that secures the lid during processing. The flat lid is
for one use only while the bands can be used repeatedly if they remain in good
condition.
* It will be necessary to double-deck the jars to achieve the maximum capacity of your canner; see the
information in the Selecting Jars section. For the boiling water method, do not double-deck the jars.
01785 4033-017A CUL English weighted gauge induction canner.indd 11
01785 4033-017A CUL English weighted gauge induction canner.indd 11
12/13/19 10:34 AM
12/13/19 10:34 AM