Radiator valves question

[Zach054]

Radiator valves question
Hi guys, got supplied some corner valves but they have a rubber to go into the radiator inlet to create a seal.

Well I imagine that's the idea, fit hundreds of valves but always used Ptfe or Loctite. Never actually seen one like this.

Will the rubber do the job, or should I remove and fit as normal with Loctite?

Any advice be appreciated

Thanks

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