Thread size & type for an F75TLR Drain Plug?

[Hesh]

I want to get the right fitting to help change the oil for the lower unit of an F75TLR without much leakage.
I would like to know the thread size and type (metric or british) for the drain plug (part # 688-45341-10-00 PLUG, DRAIN)
I have a small manual pump with a plastic fitting that does fit! Its diameter is a bit bigger than the drain orifice.
Thanks.

[boats.net]

I beleave it's a 14mm thread. Plastic fitting is the best to avoid risk of damaging the threads.