Eliminate 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, ensuring dependable performance across countless heating cycles. Simple to install during routine service, they keep your heater running at full capacity.

Key Benefits

• Built for 300 Heaters: Factory-spec dimensions match MasterTemp and Max-E-Therm 300 heater tube sheets precisely, providing complete and reliable sealing coverage.
• 10 Factory-Spec Seals: Comes with 10 O-rings for full tube sheet coverage, creating a pressure-tight barrier against water seepage.
• Energy-Saving Seal: A proper seal eliminates heat and pressure loss, letting your heater deliver its full thermal output without wasting energy.
• Industrial-Grade Rubber: Produced from compounds that resist heat fatigue, chemical exposure, and compression set, maintaining performance through countless heating cycles.
• Service-Friendly Design: Installs quickly during scheduled maintenance, requiring no special equipment to achieve a factory-quality seal.

What's Included

• Pentair 77707-0118 Tube Sheet Coil Sealing O-Rings

Compatibility

• Pentair MasterTemp Heaters Models: 300NA, 300-LP
• Pentair Sta-Rite Max-E-Therm Heater Models: 300, 333

Specifications

• Brand: Pentair
• Part Number: 77707-0118

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77707-0118
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