Reddit reviews ZENY 4CFM 1/3HP Electric Vacuum Pump Refrigerant R410a R134a HVAC Deep Vane Air Conditioner w/ 1/4" Flare Inlet Port
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Inlet Port: 1/4" Flare, Warm note: 1)Pressure Scale:0~400psi, 0~140psi 2)Length of hose:1.2m Red:1/4''-1/4'' Yellow:1/4''-1/4'' Blue:1/4''-1/4'' Please make sure your manifold gauge is in accordance with this size. Any question in using, please contact seller first.High Efficiency and Low Noise, Heavy-duty Aluminum Alloy Casing, Oil Drain Plug Positioned at Bottom of Oil Reservoir,Internal High Volume Cooling Fan for Extended UExhaust Port with Exhaust Cap, Direct Drive Motor Allowing Easy Starting Which is Maintenance FreeOil Sight Glass For Monitoring Oil Levels, ON/OFF SwitchNon Slip Cushion Handle, Comes With a Bottle of Vacuum Oil
Something like this:
When I transfer worts and don't want to lift the carboys, I use those rubber two-nipple caps on the receiving carboy, then a kind of thumper jar between the receiving carboy and the pump to prevent liquid intake.
Although if sucking up high-purity ethanol, it's not a bad idea to also include a cold trap to keep any ethanol from getting into the pump seals. I use a mason jar full of ice-cubes for this.
If you don't want to buy something, you can also scavenge the pump from an old (but running) refrigerator or water cooler. They'll pull a decent vacuum on one line and spit out pressure (and refrigeration oil lubricant) on the other. You want to construct a kind of apparatus to capture that oil and return it to the pump.
I did a lot of vacuum investing/casting of resins using only an old refrigerator compressor before I bought a (used, professional) version of the thing in the amazon link.