【建筑】井壁管（堆井壁管）、套管【建筑】井壁管（堆井壁管）、结晶器管，套管

outer casing

casing ring

sausage casing

ignition distributor casing, air-tight

casing of switch with a handle serving a purpose other than the actuation, lever switch

bell-weevil hanger【油气】;casing hanger【油气】

gear casing

casing O-ring