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77707-0118 Pentair Coil Sealing O-Ring Kit | MasterTemp & Max-E-Therm 300 Heater Tube Sheet | 10 Pack

Marsoni M251S
Sale price$39.99
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77707-0118 Pentair Coil Sealing O-Ring Kit | MasterTemp & Max-E-Therm 300 Heater Tube Sheet | 10 PackEliminate tube sheet leaks and restore your heater's sealing integrity with the Pentair Coil Tube Sheet Sealing O Ring Kit (77707 0118), built for MasterTemp and Max E Therm 300 heaters. This 10 pack of factory spec O rings delivers complete tube sheet coverage, creating a pressure tight seal that prevents water seepage and energy waste. Each O ring is produced from industrial grade rubber compounds that resist heat fatigue and chemical attack,
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4.5 ★★★★★
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Mike
Houston, US
★★★★★ 5
Works
Decent quality, somewhat flimsy, not bad for the price. Fit perfectly, correct thickness.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 17, 2025
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Verified Purchase
Brienne
Lexington, US
★★★★★ 5
great and the price is right
Fits perfectly and was very reasonable compared to the Oil change place.
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Reviewed in the United States on December 25, 2025
B
Verified Purchase
balmos
West Palm Beach, US
★★★★★ 5
Good product
It fits like it is supposed to.
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Reviewed in the United States on August 19, 2025
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Verified Purchase
Horatio
Chelsea, US
★★★★★ 5
Easy to install.
Works as intended. Easy to install.
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Reviewed in the United States on July 13, 2025
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Verified Purchase
Tank
Los Angeles, US
★★★★★ 5
Does the job at half the price
No problem at all
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Reviewed in the United States on May 7, 2026

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