Search for "Excel 3" or "Excel 5" and you will see a thread with information to build your own which is far better than Festool pump.

I already have a double diaphragm pump like the excel 5 that is part of my workbench and works great for vacuum holding, bagging, etc.  I'm mostly interested in the low height form factor and systainer stacking of this vac sys vp configuration for portability.  I'm not looking to buy the Festool unit (can't really do that anyway unless you're willing to fork over major gold to a scalper now), rather I'm interested in the pump that they used as I'm thinking about building something similar of my own into a systainer.  I'm guessing that Festool didn't design and build their own vacuum pump, so I was hoping to figure out what they used.

If anyone else in interested, Those photos helped me figure out that the pump is actually made by Busch.  I'm pretty sure its an SV1003D.  They definitely went with a top of the line pump manufacturer, not surprising.  Hopefully that helps folks on here order the pump rebuild kits and save a bunch of money in due time.  The carbon vane(s) in these oilless rotary vane pumps do eventually erode away.  It also means that if anyone wants to build a like for like 120v US version, you're in luck.  You could buy a few of the spare parts from Festool, like the molded liner and electrical / air interface parts and then machine out your own systainer for it.

Here's a SECO SV 1003 D on eBay...

https://www.ebay.com/itm/363511051186

It looks like there are two versions sold in the UK, one is a 120v version and the other a 240v version.  The GB 120 version would be the one to have for use in the US.  I actually just got that SECO pump mentioned on eBay.  My only concern with it is going to be cooling.  I need to set up a temp probe and mock up the airflow to make sure it stays cool.  The 1003D has a lot more heatsinking surface area on the pump head and motor.  This setup might need an additional fan in the systainer for cooling.

As for dual voltage, I stand corrected.  I did some more digging and while I thought these were dual voltage, they are not.  The pumps/motors appear to have specific part numbers and winding configurations for each voltage, so its not as simple as changing them between a series / parallel winding configuration to switch between 110/120v and 220/240v.

@PaulMarcel, there wouldn't be a notable difference between 110v and 220v performance on these things, they aren't large motors, high power draw, and don't see a lot of hard loading.  All having a 220v version would really accomplish is making it a pain to find an appropriate outlet for it if you ever use it outside the shop.  :-)

I know not exactly related, same brand of motor is used on my Doscornio vac clamp

"Better" is a bit of a garbage term, as it requires one to define the criteria.  Comparing diaphragm pumps to rotary vane pumps is kinda like saying this hammer makes a terrible screwdriver.  Yes they both install fasteners, but they are also tailored to different applications.  Power consumption, flow rate, ultimate vacuum level achieved, noise, contamination tolerance, ease of service, build quality, form factor, and a whole host of other criteria all come into play.

I wasn't wanting this thread to turn into another "Why would you want X when you can get this other thing that someone thinks is better instead".  That is why I qualified what I was looking for.  The vac pump in a small systainer has the features I'm looking for in a pack out workholding vacuum pump, so recreating that is the focus. Busch makes great oilless rotary vane pumps, but I'd say that my $160 Chinese made diaphragm vac pump that's been in the shop chugging away for almost a decade now is also a good pump.  Its been reasonably quiet and perfectly reliable.

Looks like a nice little configuration.  Some initial testing looks like that pump I got on ebay will do the job without any significant heat issues, but I'm a fan of a little engineering overkill, so I'll put a low noise fan with it as well.  I'll take some pictures when I have this thing built and make any models / 3D print files I create along the way available to anyone that would want them.