Intex inflatable hot tub without pump (Upper Walthamstow E17)

I'm not sure if this will be of any use to anyone but thought I'd check rather than just taking it to the tip.

We've got an intex inflatable hot tub like the one in the picture, but it doesn't have the pump and it has a slow leak. I would pump it up each day to stop the water escaping. As there is no pump you'd either need a pump or would have to close over the hole where the pump goes.
It's been cleaned but it isn't the best.
I should have taken photos when it was up last weekend but I forgot.
If anyone is interested, please let me know!
We have the hot tub cover and mat it sits on but don't have the inflatable that sits on top of the water under the cover.