channel, pipeline, drainage pipe, duct, leader, waterway, canal, flowoff, condolet, thoroughpass, more...

barrier, blockage, impediment, hindrance

electrical conduit, flexible conduit, metal conduit, PVC conduit, more...

rigid, ileal, flexible, main, electrical, underground, major, important, nonmetallic, closed, mere

vessel or duct,   pipe to,   object to channel,   pipe through,   channel through