Whats missing??

[chaz g60 0]

After the nightmare week i've had with the mechanic meesing my timing up when changing the belt, i find this.??? He said the problem was not the timing but a little hose from the inlet was broken and he'd replaced it.

What should be on the left of this little "t" section??

And would it be affecting the car's performance?

[chaz g60 0]

I found in the cover the missing pipe and when i fitted it my idle is dropping from 1000 to 750 so thats that sorted but..... is there any reason the mechanic who screwd up my timing removed it or has he just forgoten it??