Product Overview

The Pentair 77707-0120 O-Ring Kit is a genuine Pentair replacement manifold O-ring kit for the water system of Sta-Rite Max-E-Therm and Pentair MasterTemp pool and spa heaters. It is used to reseal the manifold and tube sheet coil connections during heater water-side service.

Ideal For

Repairing water leaks at the heater manifold or tube sheet connections

Service technicians resealing the water system after heat exchanger or manifold work

Owners of Sta-Rite Max-E-Therm and Pentair MasterTemp heaters

Key Features

Genuine Pentair OEM part: direct replacement under part number 77707-0120.

Manifold and tube sheet coil sealing: replacement O-rings for the heater water system.

Fits two heater families: Sta-Rite Max-E-Therm and Pentair MasterTemp.

Specifications

Warranty & Compatibility

Compatibility Notes

This kit is used in the water system (manifold and tube sheet coil) of Sta-Rite Max-E-Therm and Pentair MasterTemp heaters. Confirm your heater model and the part number in your heater's parts list before ordering.

Installation Notes

Turn off power and gas to the heater and relieve water pressure before opening the water system. Replace all O-rings at each opened connection, make sure sealing surfaces are clean, and check for leaks after the system is refilled and restarted. Follow the Pentair heater manual for your model. Service should be performed by a qualified technician.

Customer-Facing Q&A

Q: What is the part number of this O-ring kit?
A: The Pentair part number is 77707-0120.

Q: What is the UPC?
A: The UPC is 022315301603.

Q: Which heaters does the 77707-0120 fit?
A: It is for the water system of Sta-Rite Max-E-Therm and Pentair MasterTemp pool and spa heaters.

Q: Where are these O-rings used?
A: They seal the heater's manifold and tube sheet coil connections.