- Bluseal integrity, proprietary, food-safe material developed for a stronger seal, more sealing power prevents buckling, safe to use with high pressure canners
- Poplok assurance - the distinctive "pop" feature provides an audible and visual assurance of seal integrity through site, sound, and touch
- Quintek protection - five layers of interior and exterior corrosion protection surrounding a steel core
- Recommend tightening with three fingers to ensure the correct tightness, do not over-tighten for a proper seal
- More sealing power prevents buckling, safe to use with high pressure canners
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