How do I remove permanent airlocks in line in a pipe that is higher than the existing system air vents?

If the pipe is exposed, you can cut into it, and place a tee-piece (code 28103200), with two inline 24×19 monoblocco threads and a 1/2″ FBSP connection, facing this upwards (fitted as an inverted tee). Choose monoblocco connectors from our range to match your pipe (take care of the pipe wall thickness). Then screw in a manual air vent 00400004 into the tee.