Has anyone compared this to the Astro or Park Tool models?

Yes , I own several of these and several park tool for different grease , in my honest opinion these are the exact same thing without the paint

Can you put a hydraulic nozzle on this mini-gun?

Well John I'm staring at it and it looks like a 1/4"X20 thread (internal on the gun) but it is very small so it's hard to imagine a hydraulic nozzle this small. It sure isn't Zerk size. Good luck. OBTW it is a great little gun!

Is this the vacuum model or the spring model?

Both. You apply pressure through the bottom with a screwdriver pushing up on the bottom plunger to get the grease to the head and then the head vacuums it in via positive displacement. Works real well I might add. If you wanted to, you could add a spring in the bottom to push continually but in my experience, it's not needed.

Does the container have to be hand filled or will it take the smaller mini grease tubes also?

The instructions, included with the tool, show hand filling, they make no mention of use of a tube. I filled mine per instructions...very easy and it works well.

Manufacturer	Dualco
Brand	Dualco
Product Dimensions	20.32 x 13.34 x 5.72 cm; 113.4 g
Item model number	700231
Manufacturer Part Number	700231
Item Weight	113 g

DualcoGrease Gun with Short Nozzle

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