Fitted to suggested vacuum pump from Amazon, pump existing fitting seems to be fitted with thread lock so I needed an impact driver to loosen without damaging pump. 8mm OD pipe just pushes in, works well.
Works amazingly very strong grip simple to set up, even when material is distorted it just needs a push to create a seal and it holds.
This is great fir restricted places like a shed.
Great design works for me better than a side hinge, much less bulky and inherently accurate
Bought with hinge dogs the set up time knocking out shelves repeatably is almost gone, robust and well made highly recommended as a dual purchase.