The Classic Machinery Network

i want to make a couple of attachments for my sumitomo excavator both require hydraulic pressure, i was thinking i could just tee of the ram that works the knuckle boom with a valved t fitting that isolates the ram on the boom and then feeds the attachment instead , if it was a jcb i would expect the fittings to be BSP but its Japanese as far as i can tell a 26mm spanner fits , can any one shed any light on what size fitting they might have used before i spend my money on fittings that dont fit lol

thanks Andy