KWAYT Sonic tubes are Push-fit type CSL tubes are made by thin black annealed steel tube, with an enlarge end in a bell mouth shape .Specially designed rubber gasket for the bell mouth ensure quick installation and perfect sealing to keep the tube integrity and avoid the entry of other material.

Drilled shafts are prepared for integrity testing by CSL during their construction by installation of at least three sonic tubes. These tubes are usually attached to the reinforcement cage along the full length of the shafts. After concrete has been poured, the tubes are filled with water. In CSL, a transmitter emits an ultrasonic signal in one tube and the signal is sensed some time later by the receiver in another sonic tube. Poor concrete between the sonic tubes will delay or disrupt the signal. The engineer lowers the probes to the bottom of the shaft and moves the transmitter and receiver upward, until the entire shaft length is scanned. The engineer repeats the test for each pair of tubes. The engineer interprets data in the field and later reprocesses it in the office.