The blue plastic ones tend to be thick, but I would recommend a metal tap rather than plastic.
I have two big thick blue ones in the garden. They've been there for about 20 years. Usually full.
No cracks or splits. Plus I'm in the freezing north (well north of London - East Mids).
@CyclocrossHarry started
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The blue plastic ones tend to be thick, but I would recommend a metal tap rather than plastic.