Hello Has anyone seen an olive like this before on 15mm was doing some plumbing and removed pipe to replace with new and new olive but new olive seems a bit small and slightly leaking even though its a 15mm fitting. Do they still sell this
Old imperial style compression joint with a conical olive. They would usually flare the end slightly when compressed to obtain the watertight seal.
If its a new fitting and olive on the old pipe and the old pipe is an imperial 1/2" then a 15mm olive will be tight on the pipe. I would advise you take it apart again and clean the pipe up nice and shiny and use a copper olive. If not then a wrap or 2 of tape as @dilalio suggests
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