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Norman,
The older style back folw had large nuts, which it look like that 's what you have . The newer style will have much smaller nuts.
So what you will have to do is remove(un screw) the end pieces and use all parts from the new one. Not real hard.
Shut off power to boiler
shut off feed valve to boiler
close any valves to the radiators
drain pressure off bolier, watch pressure guage should only be about a couple gallons.
un do unions and replace valve.
be careful it will have a arrow with flow direction.
If you have any problems give me a call
Jeff
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