Thanks guys,
@Dtwo Great idea, I had stuff to do around Botany today so dropped in the East Tamaki branch, and they had some. Unbranded, not Trident 102, but it'll do the job. I had a look at their website previously and no sanitation hose was listed, they told me their website was pretty outdated.
@marinheiro HCD flow seems to be the same as the others, no sanitation hose above 38mm. At least I've learnt that what makes a sanitation hose odour permeation resistant is the added nitrile (at least 15% required).
@Winter@waikiore It's a French boat, made for cheese eaters :D. Joke