Would this type of keg be refillable?

[LesTom]

I'm a big fan of Brewdog's Punk IPA and Hazy Jane and just noticed my local Tesco are selling 5 litre kegs of both. Would they be possible to refill with my own home brew? I attach a photo of the keg with the top bung in the hope that someone can answer my question.

 

[crowcrow]

like one of these, so yes should be.

 

[foxbat]

Aren't those the kind that have a liner that wears out and then you get a taint from contact with the bare metal?