Chemtrol Active Chlorine PPM Sensor - 0-002 ppm - Sea Water material_Powder Coated Steel The 18 inch measurement is

The 18 inch measurement is the distance between the pool ladder rails

The second image shows the frame with panels and artwork as an example

They have accurate operation over a wide-range of pressure flows

This is a PVC Schedule 80 90 Degree Elbow with Slip x Slip fitting connections that measure 2-1/2 Inch

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Chemtrol Active Chlorine PPM Sensor - 0-002 ppm - Sea Water material_Powder Coated Steel The 18 inch measurement isThis is a Chemtrol Active Chlorine PPM Sensor, no wire, with 0 002 ppm readings for sea water pools or tanks. The Active Chlorine Menu is used to calibrate the Active Chlorine sensor. The new Chemtrol PPM solid state sensors feature superior precision and control of chlorine levels, with industry leading reliability and low maintenance requirements. These probes are so precise and reliable that they are covered by a 2 year warranty. The PPM sensors