80mm/8cm OD is too small for soil, too big for domestic water supply.
80mm circumference is roughly 25.4mm OD. That would be 1/2" 9lb lead.
3/4" 9lb (smallest 3/4" OD) is just over 30mm OD.
1/2" 7lb (most common domestic size) is a gnats c*** over 23mm OD - 73mm circumference.
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