Cameron,
Yes, the fitting just screws together. It would probably be wise to put a sealing washer of some kind (rubber, fibre, dowdie seal etc) to ensure a really good seal. Go to the enzed shop and have a look for yourself to see if its suitable. They are relatively cheap at approx $12 - 30 depending on size etc.
I haven't figured out how to put a photo on here as yet (just new to the forum), but if you send me your email I can email back a picture for you. My email is
colinh@qldbreathing.com
good luck