hard or soft copper line for a valley oil gallery bypass line?

Newbomb Turk said

BTW. your assumption that the pressure from each feed is the same. It's not. Also consider the FACT that somewhere in that pipe there are two different columns of oil meeting. That point can move back and forth in the pipe as the local pressure changes. Pressure and no flow. It happens.

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Your assumption about what you think I assume is incorrect. I will repost #54 with my question.

"That is not my assumption. I didn't say pressure was equal through out the engine. I'm trying to figure out how having opposing feeds in the gallery stops flow at some point in the system. Can this only happen if the pressure is different at each end of the feed? or will this still occur if the feed pressure is the same on each end?"