View Full Version : access panel markings
bdoug10
26th May 2014, 09:45 AM
Not sure what they are called but like a manhole in the ground but not as big usually has pipes in them
Have a blue one with AV on top any one no what it is?
BrettM
26th May 2014, 11:51 AM
Probably an air valve. Air compresses at a higher pressure in pipes compared to water, so air valves are normally installed at the highest points of a system to relieve the pressure.
bdoug10
26th May 2014, 11:59 AM
Thanks
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