Extract by Vac
Brothers of The Benz
You using the "Top Sider" should not be amazed if the vessel collapses, after all it has 29.9 psi, or some pressure close to that on the surface of the vessel.
There is an alternate method of Top Sideing and that is to use a electric driven mechanical oil pump.
For the DIY owners, this gadget can be assembled for less than $25.00 and it out performes the suck pumps many times over.
As for you, Larry Bible, move over and make room for me in your club house, you scalawag you.
Happy Trails Beep Beep from The Spiderman in Houston!!!