Smeg PU64 - Manual (Page 11)

Instructions for the Installer
13
7)
Always use pipe-joint compound made for use with NATURAL
GAS and L.P. GAS between pressure regulator D and adaptator C
and between pressure regulator D and pipe E. If flexible metal
conductor is used, be certain tubing is not kinked.
Use only pipes (E) conforming to standard regulations in force,
inserting gasket B (supplied) between fitting A adaptator C.
The adaptor C must be fitted on the gas connection A before fixing
the hob.
Always place a suitable sealing medium (such as Teflon tape)
between pressure regulator D and adaptator C and between
pressure regulator D and pipe E.
8)
Plug power supply cord into grounded outlet.