On Tue, 14 Aug 2018 13:34:50 -0700, Bob La Londe
wrote:

On 8/14/2018 12:51 PM, Bob La Londe wrote:

Now an odd question.* Probably a dumb one at that.* What is an air
compressor pressure switch with 4 ports intended for?* When I was
shopping for one I saw single port and 4 port models.* Both were under
$20 in generic brands and not much more for name brands.

Ok, doh! Yeah, that was a stupid question. LOL. A single port is
pretty much an exercise in additional expense since there's no place for
a gage or pop off valve. LOL.

Glad I ordered a 4 port.
Damn!, now I have to put shoes on and go down and look how I rigged up
my 2CFM Gardner/Denver I paid $3.00 for ten plus years ago. Neighbour
couldn't imagine why anyone would want an air compressor untill the
tubless tires on his snow blower started leaking.

Ah-hah!a real plumbers nightmare of used fittings, nipples and a four
port manifold - some day I will take it apart and re-do it; but then
again, it ain't broke.