Places to pick up parts for WMO setup

I am in the process of setting up a WMO filter and having a heck of a time locating some of the parts I need.

I thought it would be nice to have a thread with links for filters, filter socks, and other expendables.

Mainly I would like to know where to pick up inline filters and the "caps" they screw into.

I have found one pretty good site. Feel free to post whatever you have. Thanks guys.

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