Sometimes these larger valves are for quickly deflating but can also be used for inflation too. Many of them are “two stage” where the top part of the cap is a regular sized valve and the bottom is large like in your picture. If you only have a regular inflator, then you can try to stick it in there and seal around the rest of the opening with your hand. If you wanted some weight in there, I don’t see why you couldn’t fill it up with water at least to the valve and finish it with air.
this post was submitted on 06 Sep 2023
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Do It Yourself
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I actually did that and it was hell and a half to fill it up and even worse to empty it all out. I checked for an opening on the valve's cap but there's nothing to fit in there, infortunately