Cast iron radiator connectors

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Hi all.

I need to find some connectors for these radiators to be able to connect to some normal size copper pipework.

Can anyone give me any hints on the size I should be looking for?

Thanks

Stuart
 

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Thanks, any idea on what thread size it will be on each radiator or is there a choice of a lot?!
 
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It will almost certainly be a BSP size.

The nominal measurements are nowhere near the measured size, but you'll find a table explaining it.

You will not be connecting the pipe to the radiator, you'll be connecting the pipe to a valve, and the valve to the (removable) tail in the radiator.

I expect it'll be a 15mm x 1/2" BSP valve. Possibly 15mm x 3/4" BSP

You can probably find a valve that will fit the union and nut already in the radiator. They can be very difficult to remove, if old. Modern practice is to put PTFE tape on the threads of the tail. In fifty years time we'll know if it worked.
 
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If they're connected to a modern combi boiler, be prepared for a load of grief from the rust getting in the plate hex and causing problems.

Won't be an issue with an older boiler
 
Thanks all. These are quite chunky - some photos below. Although I’m still not sure which bit is to be replaced when you refer to the tail. Here are some photos giving some scale.
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Thanks all. Here are some photos showing the scale of the radiators just in case it changes anything.
 
The tail is the Chrome brass bit which is part of the valve !!

The hexagonal ones are reducing bushes .
 

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