QRP Silicone GROMMETS are BPA-free USDA Food Grade Compliant and are produced by a reputable food container manufacturer.
QRP white Grommets fit any brand Mason jar 1/16″ plastic caps.
QRP clear Grommets fit most 3/16″ thick glass lids.
QRP Grommets easily insert into 9/16″ diameter lid holes (1/2″ may be too tight, pushing the airlock into the lid may cause the plastic lid to crack; 5/8″ may cause a loose fit for the grommet).
QRP Grommet center hole is 3/8″ and is the standard size for Fermentation Airlocks.
We understand your health concerns. QRP products were developed to help our director overcome prostate cancer. ALL QRP parts and products are