Either will work, but I believe you will have better system drain if you have your drain port on your inlet. I've had mine on my outlet, and once the res drains, it takes more work to get the rest of the system to drain. For your t-fitting, you'll need a male-to-male spacer/extender between the fitting and the inlet/outlet on your pump/res combo, the other side will use the fitting's thread. If you have a little extra cash, a dataVac blower really helps when it comes to draining your system. Otherwise, you'll be blowing air yourself and that's faint-inducing.
EDIT: When draining and you start to blow, or use a blower, don't make the mistake I made (and probably half the peeps here) and leave one of my other ports open, like on the top of the res. It will shoot out like a geyser.
ZMT watercool setup -- Phanteks Enthoo Elite -- hwlabs gtr 420 x 2 -- noctua A14 PWM x8 -- d5 pwm -- 9900x -- x299 TUF Mk1
Corsair Hydro X XC9 -- 64gb 3200 tridentZ Royal CL14 -- AX1500i -- 2x 7600p on hyper m.2 VROC 4TB -- EK ZMT Tubing -- Ek Fittings -- dual Aorus Waterforce xtreme 2080ti -- asus PG279UZ monitors x3 7680x1440 surround
EKWB 1080ti blocks x2
EK Supremecy EVO RGB
Noctua A14 PWM x8
EK D5 PWM pump/res
Corsair Commander Pro
Phanteks Enthoo Elite
Windows 10 Pro
Corsair K95 RGB Platinum
Corsair MM800 Polaris
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Last edited by KCDC; 08-09-2019 at 08:01 PM.