Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
Sam at 4th element in UK will sell you one. (not Fourth Element)Take about 10 days.
The XTX20 is marketed for diving in water temps greater than 10 deg C.
However, bear in mind that other balanced second stages, notably the S'pro S600, has no such 'limit' in its marketing and the current S600 does not have an all metal cross-case body whereas the the XTX20 does; this makes the latter much more resistant to freezing. Also, the XTX20 can be upgraded, if you really want,simply by replacing the plastic retaining nut with a metal one. Any Apeks dealer should be able to do this for not much money and it is literally a job that takes less than a minute.