You can find a needle valve that uses the British connection, I think they have way better looking connections anyways. The common water cooling kits for PC have those BSP connections. There is an adapter but I'm sure they have needle valves in the connection you need.
You just have to google whatever connection your country uses. I mean, how can they not?
Oh and don't buy those Asian clones, unless your in asia and live close to their company for refunds and exchanges.