MVP PSA Adapter Set

This set includes a PSA Wide Mouth Adapter Lid and Lid Key for wide mouth mason jars. It provides a tight seal and higher vacuum retention.

• The description claims this is the best mason jar adapter on the market.
• The description claims it fits the widest variety of mason jars.
• The description claims lids don't come loose over time or upon removal.
• The description recommends against using non-MVP lids with high vacuum.