The Thermoperfo mounting base is the middle part of the mulch film/ground cover perforator (see the Tips tab). Its female threaded tip is mounted directly onto the torch, then the desired cap is attached to its end with a set of screws.
When the torch is in use, the flame heats the cap walls. Once hot, these easily perforate any type of mulch film and ground cover.
NB – The socket can be very hot after heating and stay hot for a while.