Spare retainer nut for a JLW-Canners canning pressure gauge.
Related Products
JLW-Canners, Canners Vacuum Gauge
Canning vacuum pressure gauges are designed to check the vacuum in a sealed can or jar. These gauges can be used on on canned food or drinks.
The test is performed by pressing the needle of the gauge through the top of the can. The rubber gasket ...
