Mea culpa...!...um...yes it was...bugger!
There's a write up re. the brass fitting somewhere here early 2014 The original plastic one split during 40+ deg C heat just before Christmas 2013 during a trip from Melb to Kiama. IIRC the replacement 1/4" BSP fitting has the same internal dimensions as the plastic oem part. Still waiting on the photos SWMBO is away caring for her Mum. I am suffering severe p38 withdrawl... Glad it's got a good home!