GE Hydran 201i Installation Manual page 17

Hydran* 201i Installation Guide
Figure 7: Do not Paint the Sensor or Clean it with any Solvent
7. Do not use a pipe wrench or chain wrench to install the sensor. Doing so may
cause serious damage to the sensor, thus voiding the warranty. It is
recommended to use General Electric's Hydran 201TW tube wrench (see
Figure 8 below) to correctly install the Hydran 201 sensor. One Hydran 201TW
tube wrench per site is recommended.
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17996 Rev5, August 2013