I see part of a number on the fitting, that number will tell a hydraulic shop what style it is... there are many different models of quick connect fittings, so that number is important.
and even so, that is going to be a slow way to drain the oil, as those fittings are generally made to pass oil that is between 1000 and 6000psi, so without pressure behind it, the oil will pass thru it slllooowwwllyyy..... especially if its cold.
the PO probably had a pump that he hooked to it to suck the oil out.... a
mityvac fluid evacuator is a great tool to suck the warm oil out the dipstick tube, without any danger of drips or spills.... there are other brands to choose from, but that link shows a good price on the mityvac brand.