1 Central electrode
2 Terminal nut
3 Insulator locknut, or electrode nut
4 Insulator mica rings
5 Insulator body (porcelain)
6 Assembly nut
7 Copper-asbestos washer
8 Plug body
9 Side electrode
1 Central electrode
2 Terminal nut
3 Insulator locknut, or electrode nut
4 Insulator mica rings
5 Insulator body (porcelain)
6 Assembly nut
7 Copper-asbestos washer
8 Plug body
9 Side electrode