Product Overview

The Swimables SW-41-120 Manifold O-Ring Kit reseals the water manifold on Pentair MasterTemp and Max-E-Therm pool and spa heaters. When manifold O-rings flatten, crack, or harden with age, water can seep from the heater's water connections. This kit gives you fresh seals for the manifold so the heater can run leak-free again. It is an alternative to the Pentair 77707-0120 manifold O-ring kit.

⚠️ Important Purchase Notice

Confirm your heater is a Pentair MasterTemp or Max-E-Therm model before ordering. Heater service should be performed by a qualified technician. Inspect the shipment upon arrival and report damage promptly.

WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.

Ideal For

• Fixing leaks at the heater manifold.

• Replacing worn or brittle manifold O-rings during heater service.

• Technicians who want a lower-cost alternative to the Pentair 77707-0120 kit.

Key Features

• Sized for the water manifold on MasterTemp and Max-E-Therm heaters.

• Complete manifold O-ring kit in one package.

• Made by Swimables, which builds replacement parts to match or exceed the original components.

Benefits

• Stops water loss at the manifold connections.

• Helps protect surrounding heater components from moisture damage.

• Restores the manifold seal without replacing the manifold itself.

Compatibility

For use with Pentair MasterTemp and Max-E-Therm pool and spa heaters. Pool360 lists the Pentair 77707-0120 as the equivalent kit. Verify your heater model before ordering.

Installation or Upgrade Context

Turn off power and gas to the heater, shut off water flow, and relieve system pressure. Remove the manifold, replace each O-ring, and lubricate the new O-rings with a pool-grade silicone lubricant. Reinstall the manifold, restore water flow, and check all connections for leaks before turning the heater back on.

What’s Included

• One Swimables SW-41-120 manifold O-ring kit.

Specifications

Customer Q&A

Which heaters does this fit?

Pentair MasterTemp and Max-E-Therm heaters.

Is this the same as the Pentair 77707-0120?

It is a Swimables alternative to that kit, sold for the same heater manifold.

Should I lubricate the O-rings?

Yes. Use a pool-grade silicone lubricant and avoid petroleum-based products, which can damage O-rings.