Universal Standard Tension Ring (Medium, 2 Pack)

Too tight and a bit rigid, but strong...I can't use, yet because I have around a cylindrical bottle to widen it a bit.

Works only OK as it's a bit too small. Would have been helpful to have had a sizing chart before purchasing.

Tried many rings so far, this one looks higher quality. I have a Vacurect 1002 and these rings look like they have a better build quality compared to the ones came with my device. Hope they last long.

must have the proper tooling to make it work