It’s a belt drive pump.
It’s a direct drive pump.
I dunno. Need a little help here folks… we need to at least know that before we can identify it for you.  A belt drive pump has a belt guard on side of the pump, a direct drive doesn’t. The belt guard is a rounded piece of sheet metal. A direct drive is directly coupled to the motor using a coupling device generally referred to as a "coupling and spider" combination.

Dimensions of HyVac Vacuum Pumps.

Is there a name plate on side or front of pump? Yes please write it down.

Direct Drive Vacuum Pump

30L and HyperVac pumps should have information on front of pump  where the sight glass is.
55L pumps have information on the side, near the handle.
HyperVac pumps have the model and serial information next to the sight glass.

Is there a catalog number and usually starting with a 9 and being formatted like 9XXXX-XXX and 8 digits long?
Yes. If it is there please check for a serial number while you are looking there?

On pumps before 1979, the serial number was just a number.
On pumps after 1979 the serial number became date specific and varied  to a degree format wise but usually the first 6 digits are the manufacturing date. Example 09098501 meaning manufactured Sept. 9, 1985. Write these down and GO Back To Index Page

No Serial#, No Catalog#, No Nothing smart guy. The previous owner of the company sometimes used adhesive labels that sometimes fell off after time went by. Government pumps don’t use typical HyVac catalog numbers but may have a government contract number OR National Stock Number (NSN)

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 Belt Drive Vacuum Pump

Yes. While you are there, is there a serial number?

On pumps before 1979 the serial number was just a number.
On pumps after 1979 the serial number became date specific and varied to a degree, format wise, but usually the first 6 digits are a date. Example 09098501 meaning manufactured Sept 9 1985. Write these numbers down and GO Back To Index Page.

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No. The previous owner of HyVac (the company) sometimes used adhesive labels that had a tendency to or sometimes fell off after time went by. Government pumps don’t use typical HyVac catalog numbers, but may have a government contract number OR National Stock Number (NSN).