Answer: couplers

AnswerCrossword Clue
couplersperson or thing that couples or links together
couplersdevice for joining pieces of rolling stock
couplersCOUPLER, one that couples (to unite in pairs)
couplersrod or link transmitting force and motion between a rotating part and a rotating or oscillating part
couplersone that couples
couplerscontrivance on a keyboard instrument by which keyboards or keys are connected to play together