This is the pump you should get. Bunnings warehouse sells these pumps for $15.
Don't waste your time/money by choosing wrong pump. As you know, COGY's rear tyre has a tricky shape on valve stem. You really have to bring your COGY with you and try the pump on COGY to make sure it works. I tried 2 other pumps before the one on the photo. Both of them did not work. I almost gave up. But the 3rd one worked.
It is interesting the pump I chose was the cheapest with extreme. It probably means, more expensive the pump is, the more complicated the socket will be, which is not suitable for the COGY's rear tyre.