well- i finally made my own unit-
i used a pressure tank from an under sink RO water purifier system, and use my veggy sucker /window A/C unit to pull vac. it works great, but is kinda slow. I am using 1/4" vinyl from icemaker for a pickup tube. all free parts.

i pulled the bladder out of tank, and removed the schrader valve. i will install a needle valve, to keep things clean if it gets knocked over. i thought of using a 20 lb propane tank, that would be easy, but i stumbled opun this, and it works great.

what is the OD on a real topsider tube?

well, no more getting under the car in the middle of winter to do an oil change

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.