Just finished the install of a 9W Turbo Twist. Install was a breeze, except of course the 5/8 hose my LFS sold me when I asked for 3/4. Geez, I guess I'll have to carry a tape measure with me next time. Set it up on the sump return line with no ill effects on water flow. While assembling the unit I noticed the internal flow chamber is shaped in a twisted fashion (duh) which allows for smooth water flow with minimal back pressure. :idea: