Vacuum in pipe

[terryf2]

I have had an outside tap fitted. It starts on first floor and goes down the outside wall. I have isolator inside and tap outside.
If I turn off tap and then isolate, then open tap to drain down, I find the vacuum created is enough to hold a fair amount of water in the pipe outside.
Question is, will the water split the pipe in winter or will the vacuum take up any expansion due to freezing.
Or should I fit a Tee in the pipe with a valve to release the vacuum and empty the pipe.
Thanks in advance for the help.

 

[powell30]

If you leave the tap open and the iso switched off any expansion due to freezing should exit out the tap....but.....to be sure, fit an air bleed valve close to the iso (above obviously) and open it when you want to drain the system out.

 

[terryf2]

Thanks Powell 30 will do.