I have a couple questions about gast pumps. I'm looking at buying a 1550 for my small Bush. Specifically this one:
https://www.ebay.com/itm/Gast-Oil-le...cAAOSwAQBauWN9

It looks like this one is configured as a "compressor" rather than a vacuum pump. After looking at the gast site it looks like the only difference I see is the vacuum pump comes with different filter and a muffler. Can they be used in either configuration?

Also, this pump is rated at 1440rpm. I would think that is just for 50hz motors. The bearing and rebuild kit is the same for every 1550. Would it be alright to just run it at 1725 rpms?

Screenshot_20200114-071007.jpg

Screenshot_20200114-071001.jpg

Thanks for any help.