G.P.O. Insulator, No. 16

Pothead Insulator

The Insulator No.16 contains a small chamber underneath the screw on cap to connect the open wire to the lead-in cable. The small hole for the open wire can be seen it the left hand images. The black variety, which appear more common, have single groove and twin groove versions. The white porcelain variety have two grooves.

RingBell : GPO Nostalgia Web site