leaking radiator -which allen key?

[John_B]

I have aleak on the raidator that appears to be coming from the connection of the body of the raiator (the white bit) with the first bit of metal pipe, i can see rusty pTFE tape around it. So i need to take this bit off. The radiator is drained but the hole is bigger than my 10mm allen key and this is the biggest size in my local diy store.
I this how i take this off or am i barking up the wrong tree?
Any advice would be great!
Cheers.

 

[ChrisR]

They're often approximate sizes, so tapering hex keys are available, but usually a normal cheapish "radiator key" (plumbers merchant) will fit ok.
You might find you have something like a cold chisel which fits well enough to grip, one end or the other.