Wow, you've always got a chip on your shoulder Paul. Notice the second post had a link to a non pressurized tank/drum pump. But alas, I know that would have required you to read and not allowed you your typical fly off the handle gloom and doom response. You asked for sub $100 links, I provided them, now you complain about them.
BTW 10psi MAXIMUM working pressure. It has safety valves and should be ran well below that pressure anyhow. Reading is fundamental.
You are making a NON-ARGUMENT with NON-FACTS.
I *NEVER* made any statement against the piston pump.. only the ones that had OBVIOUS issues in either flow rating or operation. Attack me for not cirticizing something that has nothing to criticize against? Run with that.
I will say that they list a 3-12gpm rating. Can they get a more random number? Any old barrel pump is good for a 8-10GPM with modest RPM input from your arm.
Then never mention CFM, only PSI. Most of the name brand piston pumps require nominal 8CFM. That's out of the range of most single lung oil less units. Rule of thumb is 2CFM per hp for single lung pumps. Problem is that most hp ratings on the motors are so fake that you have to divide it by half and still be off.
And if you are going to trust a HF regulator or safety valve then you really don't have a clue. Safety valves stick, regulators blow a diaphragm... you know, all that high quality Chinese engineering we all talk about. No way should you pressurize a steel (or even better, a poly) drum. If you think 4PSI is going to move motor oil at 10GPM then set it up and make a video. I wanna see that.
Oh, and the guy on ebay... yeah... I trust random sales people with a complete vested interest in getting me to buy their product.... no bias there.
Can you really be THAT naive?
I await your childish rebuttal of hoe mean I am. If you have FACTS then lets hear them. If you have anything else, not interested.