Engineering reference site.

[Drains]

Best site for reference , here

(big apologies for posting this in the Brew Room too, but it's too good to miss)

 

[Wozzaaah]

I've used that one too Si, it's superb!

 

[storm monkey]

Yep, used it a few times at work. Very helpful site.

 

[English Steve]

Same here, saved me several hours of searching for stuff over the past couple of years. Well recommended.