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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?" :
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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.I used a tape measure around the outside of the pipe, it came to 4 inches.
Go for 9 or 11 LB Lead Loc which I thinks 3/4" 22mm copper quite a large oneWhat size lead lock do i need for pipe the is
1” in diameter? I bought a 1” x 15mm and it
was to small.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.