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Zodiac 3-271 Threaded Style ORP Sensor Sota 1/2" Solid Body Style Jandy R0039300 Natural Gas Valve IID for Teledyne Laars Pool Heater Melling 57-S3 Engine Oil PumpProduct Details Designed for use in Pool and Spa water maintenance systems Used for measuring the oxidation reduction potential (ORP) in a water body, such as a swimming pool Constructed with superior materials, including a high density glass electrode, which provides excellent accuracy and longevity Features a NPT connection Easy to install and use