1/2 " the sort that fit on the bottom of the tap and have a sort of olive on them. im no pro but last time a recconected a tap i couldnt get it to stop leaking without putting ptf tape round the olive thingy
Standard copper tap connectors should only need a new fibre washer to make good seal. Speedfit or the like have rubber seal built in that should be watertight at hand tighten only
If the taps have 1/2" BSP thread then they will have fibre washers.
Before you make the connection, soak the washers in a little water, pop them in the fitting and nip up (dont over tighten). They leak when you crush the washer
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