NOTICE TO OTHER POSTERS: This guy is in Australia, so don't give him US-only advice, please!
According to the schematic on this page
http://www.aqua-man.com/schematic.asp?kc=S2202
that filter valve is either a clamp-on or a threaded style. Sounds like you have the threaded model, in which case the whole valve unscrews from the body of the filter.
I've never worked on one of those, so I'm not sure of the best way to do that -- possibly, judicious use of a strap wrench, like this one
http://www.amazon.com/OTC-7206-Multi...9894476&sr=8-2
would work.
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