Canada-Wide Shipping Look for Free Shipping label on select items!
Pick-up Location 3280 Steeles Ave W, Unit #22
Concord, ON • Click for Map & Hours
COVID-19 Notice Our website remains open for business. We offer a curbside pickup and Canada-wide shipping. Our physical locations will remain closed to the public.
Special Order

Pentair Coil and Tubesheet Sealing O-Ring Kit

List price: $98.09
You save: $22.50 (23%) Get an extra 3-10% off through our Rewards Program
-3% -7% -10%
Price in points: 1512 points
Reward points: 8 points
Special Order
I acknowledge that all replacement parts are final sale and installation of this product must be performed by a professional technician; self-installation can void manufacturer's warranty.

Quick Overview

Pentair 77707-0118 Coil and Tubesheet Sealing O-Ring Kit for Pentair and Sta-Rite heaters. Includes 10 O-rings.

Pentair Coil and Tubesheet Sealing O-Ring Kit

Proper sealing is one of the best ways to keep all of your pool and spa equipment in good shape, and this is especially true for your pool or spa heater. Water flow can be damaging to any element of your pool, but the components of your heater can be particularly sensitive to leaks.

If you've discovered that the seals around your coil and tubesheet have been damaged or corroded over time, it is very important that you replace them - even if your heater is still functioning. Over time, a leak can damage your tube sheet, leading to a costly repair (or even the need to replace your heater). Luckily, if you have a Max-E-Therm or MasterTemp pool heater, you can rely on Pentair to provide you with the replacement o-rings that you need.

The 77707-0118 Pentair Coil and Tubesheet Sealing O-Ring Kit is designed to provide an exact replacement and perfect seal for MasterTemp heater models 300 NA and 300 LP and Max-E-Therm model 333. This essential component of your heater ensures a tight seal that allows each component of your heater to function as it should.

For any pool heating professional replacing an o-ring is a fast and easy job that can be completed quickly. Be sure that the 77707-0118 Pentair Coil and Tubesheet Sealing O-Ring Kit is the right match for your current heating equipment, and you'll have your heater running leak-free after a quick repair.

Used on the following models:

  • Pentair MasterTemp 300 LP, Pentair MasterTemp 300 NA (MSTRTMP300LP, MSTRTMP300NA)
  • Sta-Rite Max-E-Therm 333 LP, Sta-Rite Max-E-Therm 333 NA (SR333LP, SR333NA)

Includes 10 O-rings total.


No posts found

Write a review
  • Installation
  • Request a Quote on Installation

    Toronto Pool Services

    Pool Equipment installation services are provided by our partner, Toronto Pool Services.

    All installations are performed by certified technicians and are backed by a one-year labour warranty. By submitting this form you will share your information with our partner and they will provide you with a quote by email. You are under no obligation to purchase the product or the installation service. Product prices on do not include installation costs.

    For more information, visit

    NOTE: Product images are for illustration purposes only and may not exactly match the actual product due to seasonal model, color or design changes. When shopping for parts we strongly recommend to check the SKU or "Part Number" which is listed on each product page. If you are unsure whether this is the correct product or need assistance please contact us.

    Just a quick reminder - Toronto Pool Supplies is an online-only store. Our Concord, ON location is a pickup point, not a retail store and we cannot service walk-in customers. If you want to pick up your items in person please place an order online first and we will email you when it's available for pickup.

    New Hours for 2021 Season: Mon-Wed: 9AM - 5PM / Thu: 9AM-8PM (Extended) / Fri: 9AM-5PM