VEVOR Pistol Grip Grease Gun, 6000 PSI, 14 OZ / 400 CC Capacity Heavy Duty Professional Grease Gun, with 19.69 Inch Flexible Hose 2 Black Flat Couplers, 1 Pointed Coupler, and 2 Rigid Metal Pipe

Yes

Yes. 90-120 psi is fine.

I never manually packed the gun . I've only used cartridges, it's so much easier.

YOU can pack it manually but it is a lot easier and less mess by using a cartridge plus you have button to release the air to bleed it.

Intake a cartridge. Once your cartridge is empty , you can repack the cartridge by hand.

I would say that as with all other grease guns that you could manual pull grease into it.But really for the convenience and not have the mess or spillage why not buy cartridges

yes

CARTRIDGES ARE EAISER, BUT YES YOU CAN PACK GREASE IN IT.

Yes it sure work with out cartridge, understand the piston is made for cartridges so there may be a little blow by. Why not just put a empty cartridge in and manual fill that up with grease.

All cartridge guns can be packed without a cartridge ,The design didnt change when they came out with cartridges