After seeing my video on the cheapest air jack you can buy, Zendex offered to send me one. Which I used then opened up.
It was so good I ordered another and paid for it with my own money.
They are available in the UK from Serenco.co.uk.
and Amazon Rakjak 3 bag https://amzn.to/2EmdX5K
Rakjak 2 bag https://amzn.to/2T5TSL3
https://www.zendextool.com/