From an experience marine engineer
and delivery skipper
As senormechanico says "bond it". The tube is conected to the stuffing box
- Eye terminal under a 2nd nut on one stud of the box
- Job done, mind at rest. Smiley Face
- Unless you have a ceramic face or double lip type seal....
Then you must drill a small shallow hole (the size of the striped back bonding cable)
-drill the hole parallel to and against the tube (aftwards into the glass)
-with a needle file clean the metal of the tube
-put the stripped back cable in the hole with petroleum jelly
-hold the cable in place with a wee 'P' clip...