Drain plug help

[los]

I've been trying to work out how to put a drain plug in, but can't find the bits that I need, I'm guessing I need a T-piece, 3 barbs and somne sort of blanking plug on the end of a piece of pipe? But I can't find exactly what I want on here.
Also I take it, I install it in the middle of the lowest hose?

 

[los]

That's great thanks. Just what I was after
Thesis fir the tip. I thought it would just come out. At least I know what to do now if it doesn't