I have two backpack sprayers (one stihl, the other makita) and an assortment of nozzles an corresponding holders.
the makita seems to be all G-1/4" BSP
the stihl is quite coy about what sizes it uses, and it has at least three thread sizes on the wand, nozzles and extension bars.
Anyone know if 5/16" and 7/16" are commonly used for such fittings? i only have 1/4, 1/2 and 3/4 fittings in my plumbing box of bits so don't have much else to test against ...