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I'm a plumber, but I've never used CPVC except to make a minor repair once on an existing system. I'm just curious - why the rubber washer? I know the PEX x male adaptor has a tapered thread (pipe thread), and I would assume the CPVC x female adaptor does also(?) If so, there's no need for the rubber washer - just some teflon tape or pipe dope. Does the washer come with the CPVC fitting, or were you planning to add it?

Edited to add: I just googled it, and saw that the washer is integral to that fitting, so you shouldn't use it with that PEX adaptor. I'd use a CPVC x male adaptor (all plastic):

http://www.pvcfittingsdirect.com/_e...apter_Mipt_x_Slip_PVC_Fitting_Schedule_40.htm,

and a 1/2" PEX x female adaptor (brass):

http://www.pexsupply.com/Wirsbo-Upo...ass-Female-Threaded-Adapter-1-2-PEX-x-1-2-NPT
 
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