A system includes an inspection robot having mounted sleds, and a number of sensors each mounted to a sled. A couplant chamber is disposed within at least two of the sleds, each couplant chamber between a transducer of the sensor and an inspection surface. Each couplant chamber includes a cone, the cone having a cone tip portion at an inspection surface end, and a senor mounting end opposite the cone tip portion. A couplant entry for each couplant chamber is at a vertically upper side of the cone in the intended orientation of the inspection robot on the inspection surface.