Yeah, I have the HF one here as well. Just don't follow the instructions. For the love of all that is holy, ignore the damned instructions and remove that little sheet metal screw that is locking the air regulator knob and back that sumbitch out before you connect an air hose to it. Trust me on this. I didn't and mine was set to WFO by some evil little Chinese *******.
Let's just say you'd be surprised how fast waste oil can come out when hooked directly to 110-120 PSI of shop line pressure. And how fast it will fill the container you are draining it in to. And how accurate an impression it can do of Old Faithful when no more room exists in said container. And how long it takes to stop flowing even after you have finally managed to remove the quick connect air line coupler with your super slippery, oil covered hands. After you've wiped the oil out of your eyes, you'll be treated to something akin to a horrific crime scene, ala Dexter, only in black. But worse. Because a body holds far less than 20 gallons. Believe me when I tell you, even 10-15 PSI is MORE than adequate to evacuate that tank at a plenty prodigious pace.
Should you decide not to follow this advise, a little heads up would be appreciated as I'd like to buy stock in the company that make those rolls of blue shop towels. Because I used at least a Costco sized case of those suckers. And an entire bag of oil dry to stop the black menace from spreading like Hitler across Europe in 1939. Please don't even ask me how many coats of Kilz and then paint it took to make the wall white again. I'm still somewhat traumatized.
