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View the thread, titled "What lead lock do i use on pipe 1inch in diameter." which is posted in DIY Plumbing Advice on UK Plumbers Forums.
How did you measure the diameter? The correct method is to wrap two turns of string around and divide by 2pi, i.e. don't use callipers. Lead loc have an FAQ list and the first one is "What size should I buy?" :
I used a tape measure around the outside of the pipe, it came to 4 inches.How did you measure the diameter? The correct method is to wrap two turns of string around and divide by 2pi, i.e. don't use callipers. Lead loc have an FAQ list and the first one is "What size should I buy?" :
If it was one turn and exactly 4 inches then that's 4.0/pi = 1.27". That's probably 3/4" - 11lb lead pipe, which has an OD of 1.233". Another close size is 3/4" - 9lb, which is 1.152" OD.
There are other sizes with ODs closer to 1 inch, which is what you originally said the OD was. E.g. 1/2" - 9lb has an OD of 1.016".
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Just buy a 1/2 7,9lb and 3/4 9lb and return what you don’t use
9 OR 11 LBS
Go for 9 or 11 LB Lead Loc which I thinks 3/4" 22mm copper quite a large one
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