Which drain plug is this?

First time post, long time lurker. Our new to us farm truck is a 99 Volvo, Cummins M11, Super Ten, single axle. Pulls better than any dually we ever owned. Other than common o-ring air leaks and a finicky super ten coming from 7 to 6, the truck pulls great.

While changing the oil in the farm shop, the oil pan has an easy drain with no levers, but a round spring loaded valve to seal the oil pan. There must be a hose the attaches with a detent pin to push the ball up so you can drain the oil. It's probably a former Fed-Ex truck and I can't find a comparable drain plug anywhere. All the plugs I find have levers to release the oil. I'd like to buy the hose and like this design.

Any ideas? Thanks in advance for the response. Merry Christmas!

Jay