Thread spec of nuts that secure handles of Beneteau seacocks

[svlamorocha]

Does anyone know what is the thread (type, pitch , diameter) of the nuts that secure the handles of the metric ball valves used as seacocks in Beneteaus? See this for a sample.

Hopefully one of our metric plumbing experts will know this, because the last time I was in the boat I tried every nut there was at the chandlers in the BVI without luck.

Yeap, I know that these CW617N brass ball valves are not good. It willl be a while until I pull the boat out to change seacocks and I just cannot stand having a seacock with a loose handle. I am far away from the boat and need to buy the nut without being able to measure on the boat.

Thanks in advance!