Wide Mouth Mason Jar Compression Lid

Wide mouth mason jar compression lid, wide mouth (3 ID x 3 3/8 OD, (76mm ID x 86mm OD) . Universal lid to be used with home made suction vessel. On how this item works follow the link below:

https://www.youtube.com/watch?v=GTOEu8MDnFo&t=54s

Item is normally stocked