Answer: bushing

AnswerCrossword Clue
BUSHINGInsulating liner
bushinga. replaceable thin tube or sleeve, usually of bronze, mounted in a case or housing as a bearing b. replaceable hardened steel tube used as a guide for various tools or parts, as a drill or valve rod
bushinglining for a hole, intended to insulate and protect from abrasion one or more conductors that pass through it
bushinga lining for a hole