This is a Stainless Steel Oil Line -3 90° JIC to Banjo 17.5″ for a National vacuum challenger 607 pump. This part fits all National Vacuum 607 PRO Challenger Series vacuum pumps.
This is diagram part #60 on the 607 PRO fan cooled pump exploded view and diagram part #55 on the 607 PRO liquid cooled pump exploded view.
The National Vacuum Equipment Part Number is 320-407-006z