"DaveC" wrote in message
news.net...
Thus spake DaveC:

In the manifold is a: Pressure relief port (tested... it does keep ahead
of
the pump)

What's the purpose of a pressure relief port? Is this an "open at x psi"
valve to keep pressure below the tank's limit? But this is what an
electrical
pressure switch does.

Dave, pressure switches weld shut in storms, or with age, or with mud-dauber
nests inside them.

EVERY compressor must have a pop-off valve to protect the tank from
over-pressure.

LLoyd