3-way diverter valve on boom for hammer/ect (Kubota)

[sidelinellc]

..have a kx121-2 super, with hyd. thumb. I d like to modify and add a 3 way, diverter valve block so as I can also run a hammer....Would any one have a suggestion , and more importantly, the thread pitch/size that is used. I appreciate any info you provide.