anyone ever used them or thought about using them?!

Basically at work we've got them on the jigs we use 2 bond panels on, their used 2 direct vac piping to suction cups which hold the panels in place etc.

Thought it was worth a go as theres loads of spares so put one on my 2wd inlet manifold inplace of the pipe that goes to the regulator, and seems to be working fine!! holds fuel pressure at idle and doestn seem any different when moving!! Luckly the pipe is the same bore as the original so it fitted into the ford rubber connector that goes onto the regulator!! Prob gona have a go at map sensor too, althou the original pipe is alot thinner so not sure if it makes a difference or not?

Thoughts?!