yes i found this out
its best to measure it, if it looks small its 1/4" if it looks bigger its 3/8th, get a ruler out if its between 8mm-10mm you want 1/4" inch screw to 1/2" barb
don't use brass as you might crack the housing,
i believe hozelock connectors can leak, and are prone to letting air in, best bet is to just attack some hose with jubilee clips, or if you want quick release use the pro ends.
wink alex