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Address low flow conditions early—many heater issues are caused by restricted circulation
Constructed for long-term service in wet and chemically treated pool environments
to prevent siphoning back into the pump when the system is off
Rotating between two cartridges (one in use
The Merlin SSSS is a shortened stainless steel spring designed for use with winter safety covers on pools where deck width or anchor spacing is limited
Pentair MasterTemp 125 Thermal Regulator | 474989 Pool Pumps Address low flow conditions early—manyPentair Thermal Regulator for MasterTemp 125 Heater Water System 474989 The Pentair 474989 Thermal Regulator is an OEM replacement temperature regulating valve used in the MasterTemp 125 heater water system. It helps the heater maintain proper internal water temperature and flow characteristics during operation, supporting stable heating performance and helping protect internal components. Key Features OEM thermal regulator: designed to match the
