Signa Pig Signaller can be fitted to all sizes of pipeline over 2" in diameter.Omni-Directional Trigger.Intrusive Pig Signaller comes with flag with mechanical locking device, wich makes it suitable for horizontal or angled installation.Model can also be supplied with electrical indication.Intrusive pig signaller can be removed, under full line pressure with specially designed removal tools, no need to shut down the line.