I hope you're sitting down
I was quite surprised how much these cost - and ended up buying a couple off the bay (one to keep as spare)
My experience was the same as yours, I just touched it with an air line and the thing gave way and the tyre deflated in double quick time. Unfortunately, it was the night before a holiday and the boot was packed to the roof but I have a mate with a FFRR who lives just round the corner, so he came out & lent me his spare and I was able to get it fixed first thing in the morning before we set off (albeit with a rubber valve)
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