Swimables SW-41-120 MasterTemp & Max-E-Therm Manifold O-Ring Kit

Key Benefits + Heater Compatibility

• Replacement manifold O-ring kit for compatible MasterTemp and Max-E-Therm style pool heaters.
• Swimables manufacturer part number SW-41-120.
• Cross-references industry/OEM part 77707-0120.
• Published kit descriptions include one rectangular manifold O-ring and 12 smaller O-rings for manifold service.
• Designed to replace manifold sealing components during heater repair or maintenance when the original O-rings are worn, flattened, cracked, or damaged.

Quick Product Summary

The Swimables SW-41-120 is a replacement manifold O-ring kit for compatible MasterTemp and Max-E-Therm style pool heaters. Swimables cross-references SW-41-120 to industry part 77707-0120. Published distributor descriptions identify the kit as containing one rectangular manifold O-ring plus 12 smaller O-rings used during manifold service. Before ordering, verify the heater model and original manifold O-ring part number to confirm fitment.

Best For

• MasterTemp and Max-E-Therm style heater manifold service
• Replacing worn or damaged manifold sealing O-rings
• Heater repairs where the existing O-rings have been disturbed during disassembly
• Pool professionals matching replacement seals by SW-41-120 or 77707-0120

Why This Matters

• Manifold O-rings seal heater water-path connections and help prevent leakage at serviced joints.
• Flattened, cracked, hardened, pinched, or damaged O-rings may not reseal correctly after disassembly.
• Using the correct replacement seal set helps restore the intended manifold sealing points.
• Matching the heater model and part number before ordering helps reduce fitment mistakes.

Common Signs You Need This / Use This When

• The heater manifold has been removed for service and the original O-rings should not be reused.
• An existing manifold O-ring is cracked, flattened, hardened, stretched, pinched, or otherwise damaged.
• Your heater parts documentation calls for 77707-0120.
• You are servicing a compatible MasterTemp or Max-E-Therm style manifold assembly.

Product Specifications

Compatibility / Fitment Notes

Swimables lists SW-41-120 as a MasterTemp / Max-E-Therm style manifold O-ring and cross-references industry part 77707-0120. Verify the exact heater model and original part number before ordering. Do not select heater manifold seals by appearance alone because similar O-rings can differ in size, material, and application.

Installation / Use Notes

Shut the heater and circulation system down and follow the heater manufacturer's service procedures before opening the water manifold. Allow the heater to cool, relieve system pressure, and disconnect power as required by the service instructions. Remove the old seals, clean the O-ring grooves and mating surfaces, inspect for damage, and install the replacement O-rings without twisting or pinching them. Use only lubricant approved for the heater seals if the manufacturer calls for lubrication, then reassemble and leak-test according to the heater manufacturer's instructions.

Buy with Confidence

Benchmark Pool Supply helps homeowners and pool professionals identify heater replacement parts using manufacturer numbers, OEM cross-references, equipment family, and practical service knowledge. For SW-41-120, matching 77707-0120 and your exact MasterTemp or Max-E-Therm style heater before ordering is the best way to reduce fitment mistakes.