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Waterproof ultrasonic sensor?

Can I unsolder the transducers from the Parallax PING sensor and replace them by these ones: http://www.parallax.com/Store/Sensors/ObjectDetection/tabid/176/ProductID/755/List/0/Default.aspx?SortField=ProductName,ProductName? They operate at the same frequency. Also, why does the PING sensor have two transducers? I guess one is a transducer and the other is a receiver, but is it the same part? Would I need to get a special waterproof receiver for the transducer Parallax is offering?

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Thanks for all the replies and well, if it's not waterproof its ok I just want it weatherproof. Anyways I'm going to use it for a firefighting robot (and you know when the alarm goes off there's water sprinklers that go off as well in most buildings, so I want the robot to be able to survive occasional water splashes and sprinkles). With that in mind, is it possible to switch the transducers on the PING sensor wkithout having to dramatically change the electronic scheme of the sensor? 

And as microbot has already pointed out: It says weatherproof NOT waterproof

40 khz is definetly not going to work under water.

 

 

IF and I mean IF it would work underwater AT ALL, then you would have to recalculate your algorithm to find out the distance, because sound travels faster in water than it does in the air.

If you look at the pdf file on the link you show ......it shows the complete simple_simple_simple circuit ....

.. One transducer for Both TX&RX ie the same transducer sends a burst of ultrasonic and waits to receive the echo.......

... looks neat and the casing is Waterproof .... however looks like you would have to seal the terminals from water..... not sure if it would work underwater though......

Ping sensors generally come in paired units..... ie on for TX and the other Matched to it for RX ....giving max sensitivity..... as far as i know they are piezo elements

isnt that weatherproof? not waterproof?