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Came across this in an email from yesterday. Click here: Stanley 450 GPM Hydraulic Trash Pump | Featured Items | www.surpluscenter.com

Yeah, I strongly suspected that your question was directed to Gringo. There's a youtube video (can't remember the title, of course) about Unimog FLUs that briefly shows a pump used with an HME. Which makes sense if a trench needs to be soaked for compaction, or emptied before being covered back...

If you're asking me, the answer is "I don't know". It hasn't been out of the tool box yet, but I'd guess it's a Stanley since the other tools I've seen are. But for draining ponds I'd get a cheap gas powered HF semi-trash pump. Bought a 2-inch version last year for pumping somewhat clear water...

I really need to learn to write "I think..." more often. Or learn to remember better. Either way, judging by the puny hoses, the trash pump doesn't need much flow to run.

The tool circuit is run by the rear pump, so there's some oomph available. How much, if any, it is choked down for the tools I don't know. There's enough to power a 1-inch version of the Stanley 3/4-inch impact the HMMH came with, but at the moment I don't even remember the flow rate or pressure...