Wine Corks - 1 3/4 in. Grade 4 Measurement:25 Self-priming (will push air) so

Self-priming (will push air) so that it can draw out of a carboy or tank

Cork trees that show a higher population of worms or fungi tend to yield cork crops which are more porous

*Please note that smaller

Fittings on either side

Tightening down the nut with tubing inside will clamp the internal locking mechanism onto your metal tube

Wine Corks - 1 3/4 in. Grade 4 Measurement:25 Self-priming (will push air) soThe entry level natural cork. This is the lowest grade natural cork we recommend. Corks are typically graded on a scale of 1 10, 1 being the best, based on the degree of porousness that the actual punch of cork exhibits. The Grade 4 corks show average porousness and is a little below the quality of cork used in many commercial facilities. They will normally seal perfectly, however if you are looking for a cork for extended aging of 5 7+ years,