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[–] remlov 0 points 2 points (+2|-0) ago 

Hydraulic Quick Coupler. Most modern excavators use them.

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[–] arniecuntingham 0 points 1 point (+1|-0) ago 

thanks. i was unaware of this. i worked construction in my youth, but that was a long time ago.

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[–] remlov ago 

Modern doesn't always equate to better. I would wager an actual pin is infinitely safer.