The manuals say 44 ft-lbs, but I use a short 3/8" ratchet and tighten until good and snug. In the past, the torque wrench said that was 30 to 35 ft-lbs and I have never had a leak. I don't even bother with the torque wrench now.
A little under the spec will not hurt anything - over torque can damage the drain plug.
Dave