I am going to drain the central heating and fit TRV's to a few rads. How much PTFE tape do I need to wrap around the threads? Have got a new tail with the TRV so need to wrap PTFE around the tail which replaces the existing rad tail, then the 2 threads of the trv valve itself.
How many layers of PTFE is usually required?
Thanks
How many layers of PTFE is usually required?
Thanks