The Base Model 57 is a visual flag indicator with a manual reset. It is a popular member of Apache’s pigPRO Series, a patented line of intrusive pig passage indicators that reliably detect the precise location of a cleaning pig as it travels within the pipeline network. When a cleaning pig passes the system’s intruding plunger, it activates the plunger and triggers a visual flag indicator, signaling the pig’s location.
The pigPROTM, the base Model 57 includes a thread mounting nipple, standard lower housing with
fluorocarbon O-Rings, hemispherical plunger with a flag assembly.
Flange Mount models are designed to connect to existing flanged connections and are available in ANSI Class 150,
300, 600 or 900/1500 flanges.
Aluminum extensions can be attached to enable detection of the pigs passage on buried pipelines. All pressure
sealing components remain below the extension module. Available in lengths 2’ to 8’.