Quick drains are pipe thread (1/8" IIRC) and torque specs really don't apply. As my daddy taught me, it's basically a "tighten until it breaks, back off a quarter turn" operation. Apply a little Fuel lube/ EZ turn, tighten until it's good and tight and doesn't leak. If I had to give a rough guess, I'd say somewhere in the 75-100 in/lb range, but don't quote me on that.