Old style ORP and pH sensors
The exposed red sensor is an ORP sensor. This connecter predates the connector to the right which includes a PVC sleeve and an o-ring sealed retainer nut.
Remove existing fittings for old style sensors
Remove old compression fitting
New Sensor Hardware
Install the new PVC sleeve into existing 3/4" tee.
Slide the new sensor into the sleeve and turn it clock-wise until tight.
Connect the new style cables to the new sensor (s). Connect the open ended tinned leads into the controller as required.
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1840 South Carlos Ave. Ontario California, 91761