What is lockshield? Thermostatic valves

I've had a look at thermostatic valves and I've noticed some are advertised as having a 'lockshield' option.
eg: http://www.screwfix.com/p/danfoss-ras-d-chrome-straight-trv-lockshield-8-10-15mm/43668

I was wondering what this is, if I need it, and if it's worth the additional cost?

Thanks!

 

If you're only replacing the TRV then the lockshield is not required , if replacing both valves then your choice.

 

The lockshield is the valve at the opposite end of the radiator to the TRV

 

Thanks, I hadn't realised that.

 

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