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swedeee
kkg337
frank9755
I've just used the one I linked to a few weeks ago, above, for an ultra.
It was great, would definitely recommend. Needed to use it a couple of times. So much better than having to actually pump manually, especially when tired, etc.
Edit
This one:
https://www.aliexpress.com/item/1005005999149230.html?spm=a2g0n.order_detail.order_detail_item.3.51edf19cSJZpRD