Other option Peter take a photo of it and the outside dia of the widest part and take it into the shop.
Too much effort Terry, get the camera out, leave it aht
Nothing's ever straight forward is it, you can't buy owt nowadays without some sort of problem. You'll sort it though, I know you will.
I had a brain wave, phone SIP and ask them, so I did, phoned at 3.02 sorry lines are closed we are open from 10am til 3pm wow, I'd like to work for them. Got through today, their fitting is "1/4 Export" so got some on ebay. It was quite funny when I asked at SIP why they haven't supplied a fitting with the compressor and he said we don't know what accessories you will use with it, I said you supplied the accessories and I can't fit them. Hopefully sorted now, but not holding my breath
Peter