Find the diameter (wrap something round it then divide the length of this by 3.14) and take it to a plumbers merchants - they'll give you what's required (you won't be the first!)
Depends on the size - I'm currently looking at one in my hand and it is a 22mm end. If you pm me your address you can have it for nothing (tiny offchance it will be the right size) as i'm not likely to use it and it's just gathering dust.
Accept my friendship request above if you're interested.
"Half Inch" lead pipe comes in 5, 6 and 7lb weights, and connects via an adapter to 15mm
"Three Quarter Inch" lead comes in 9 and 11lb (and possibly other) weights and adapts to 22mm.
The imperial sizing like "half inch" refers to the internal diameter, so 15mm copper is in that case about the same.
Warning - old lead wil often spring a lot of leaks if you move it!
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