Aqueduct Help Thread

[jwei44]

Thought I'd start a help thread since I've come across a puzzle I can't beat. Anyway. Feel free to post the level and anyone who has a solution can help. Please hide the solution somehow

Anyway. Level 4-6: The Drain Lane





any ideas?

[knc]

I had it but stupidly left the game and when I returned I can't remember so I know it can be done