Parts # 64661 and 64651 on
www.usplastics.com are plastic quick-disconnects with auto shutoff (when you take em apart you get a couple of drips and that's it) that accept 3/8" ID hose. They are 3/8" ID throughout, and provide much less restriction per pair than a 90 in your system. These would be perfect for people that want an easy to maintain system, and the pair (male and female respectively) cost a total of $10.19. For those people using 3/8" ID systems these can turn your WC solution into a modular system that can be assembled and disassembled in a few minutes.
I just thought I'd share that with you all, since this is a hell of a deal on these things. Plus, since they were designed for use with corosive chemicals, they won't turn to mush when exposed to water wetter and they will not cause corrosion.