Radiator valves question

[Zach054]

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

 

[Gasmk1]

Rubber should be good a lot of rad blanks and bleeds use a rubber seal now don’t forget they are parallel threads, will look neater without ptfe showing. You can always use loctite fluid if you don’t trust it