The impact of tubing sizes

[gabe]

With the amount of headpressure pumps have, I don't think there's actually a vacuum at the suction side of a pump.

There is a depression at the pump inlet, this is a fact, an observation if you will, not an opinion, and not debatable.

This depression causes vinyl tubing to collapse over time upstream of the pump inlet. This is also a fact, an observation, not an opinion thus not debatable either.

A solution to prevent tube from collapsing is smartcoils, but this does not address the sealing issue in quick connects.

Quick connects are only designed to work under positive pressure as specified earlier. The depression causes seal failure. Air will engulf at the seal. This is also an observation, not an opinion. Please take my word literally: I have OBSERVED this phenomenon in many systems from customers, employees, and my very own.

Please learn from my mistakes.