Looks like WW isn't doing it any more. There's been a Chieftain doing it for a little while now, & my records show it as being owned by Chinta Air of Ceduna.
I remember getting out of the plane at Leigh Creek on the way home and just standing under that shower thing next to the bowser.
Ah yes, & before that there was one pilot who would just stand there (fully clothed) while I hit him with the hose! Also believe another pilot was treated to the sight of some foreign tourist chick stripping off & jumping under the shower.
DF.
P.S. Does Swamp Duck = J (or was it G) C & your dad/brother had an Aerostar? If so, PM me!