tekile või laevaruumidesse väljuv enamasti vertikaalne toru vedeliku taseme mõõtmiseks tankides, kohverdamides ja pilssides. P. ülaots on suletud vintkorgi või spetsiaalse sulguriga.
a pipe running vertically from an upper deck to the ship's bottom so that the height of water or liquid in any compartment or tank can be measured at all times by means of a sounding rod attached to a line and lowered in the pipe
