vacuum container??
Here is the steel weld on bung.
View attachment O2SensorBung-225225.jpg
[ame="http://www.ebay.com/itm/Weld-Bung-for-Oil-Pan-1-2-NPT-Female-Steel-/190525150980?pt=Motors_Car_Truck_Parts_Accessories&hash=item2c5c2f1704&vxp=mtr"]Weld Bung for Oil Pan 1 2" NPT Female Steel | eBay[/ame]
Then use this magnetic pipe plug with it.
View attachment $_1.JPG
[ame="http://www.ebay.com/itm/Trans-Dapt-9064-1-2-NPT-Magnetic-Drain-Plug-/351112997555?pt=Motors_Car_Truck_Parts_Accessories&hash=item51bff72ab3&vxp=mtr"]Trans Dapt 9064 1 2 034 NPT Magnetic Drain Plug | eBay[/ame]