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The OEM Pentair Automatic Gas Shut-Off Switch (AGS) for ETI 400 Heaters, part number 475985, is a critical safety component designed to automatically shut off the gas supply to the heater if the water temperature exceeds 150°F. This switch ensures the safe operation of your pool heating system by preventing overheating, which can lead to equipment damage or safety hazards. The AGS switch is compatible with Pentair ETI 400 High-Efficiency Pool and Spa Heaters and is an essential replacement part for maintaining the reliability and safety of your heating system.
Highlights
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Critical Safety Component: The Pentair Automatic Gas Shut-Off Switch (AGS) for ETI 400 Heaters, part number 475985, ensures safe operation by automatically shutting off the gas supply if water temperature exceeds 150°F.
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Prevents Overheating: By preventing overheating, this switch protects your pool heating system from potential equipment damage and safety hazards, ensuring reliable operation.
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Essential for Safety: As a crucial safety feature, the AGS switch maintains the safe operation of your pool heating system, making it an indispensable part of your heater's safety mechanisms.
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Wide Compatibility: Designed for use with Pentair ETI 400 High-Efficiency Pool and Spa Heaters, this switch is an essential replacement part that ensures compatibility and optimal performance.
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Maintains System Reliability: Regular replacement of the AGS switch helps maintain the reliability and safety of your heating system, ensuring it operates efficiently and securely.
Includes
- (1) Pentair 475985 AGS
Compatibility
- Pentair ETI 400 Heaters
Additional Info
The OEM Pentair Automatic Gas Shut-Off Switch (AGS) 475985 is engineered for ETI 400 heaters. This section covers installation, safety features, and online ordering with free shipping.
Installing the Pentair 475985 Switch
This OEM switch is easy to install in ETI 400 heaters. It automatically shuts off gas if water temperature rises above 150°F, ensuring safety and system protection.
How do I install the Pentair 475985 AGS switch into my ETI 400?
Does the 475985 AGS switch ship free when ordered online?
Is the switch a direct replacement for ETI 400 High-Efficiency heaters?
What steps ensure safe installation of the 475985?
Maintaining Heater Safety and Reliability
The AGS prevents overheating by cutting off gas supply when temperatures climb too high. Replacing with the OEM 475985 ensures ongoing safe operation.
Why is my Pentair ETI 400 heater shutting off unexpectedly?
Can a faulty AGS switch affect overall heater performance?
Does replacing with the 475985 improve long-term safety?
Can I order a spare AGS switch online for future use?
Ordering and Free Shipping Options
SOSPool.com offers the Pentair 475985 AGS switch with fast delivery and free shipping. Customers receive the OEM part ready for installation.
Can I buy the Pentair 475985 switch online today with free shipping?
Is the AGS always in stock for quick online delivery?
Does SOSPool.com ship the AGS switch in original Pentair packaging?
How quickly will the 475985 arrive after placing an order online?
Diagram

Questions & Answers
Have a Question?
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Why is the pentair 400 Automatic Gas Shutoff switch a different size than mine is?
The Pentair 475985 Gas Shut-Off Switch is intended for use with the Pentair ETi heater.
It seems like you may be looking for the Pentair Mastertemp 400 Gas Shut Off Switch instead which is part# 42002-0025S.