Best Transmission Seals & O-Rings of 2026

Robert Reyes Avatar
Robert Reyes
Last Updated: Jan 10, 2026

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Transmission seals and O-rings are essential parts of a vehicle's transmission system. These small but mighty components help prevent leaks and maintain the proper pressure within the transmission. The transmission seals are typically made of rubber or silicone and are placed at various points throughout the transmission to prevent fluid from leaking out. O-rings, on the other hand, are small round rings made of rubber or plastic that are used to create a tight seal between two parts. Both transmission seals and O-rings play a critical role in ensuring the smooth operation of a vehicle's transmission system.

At a Glance: Our Top Picks

Captain O-Ring #11105 Orange O-Ring 50 Pack Cover #TOP 1
Captain O-Ring #11105 Orange O-Ring 50 Pack
ftb score rating icon 9.9
OMT 826pc Universal O Ring Assortment Kit Cover #TOP 2
OMT 826pc Universal O Ring Assortment Kit
ftb score rating icon 9.8
Subaru O-Ring CVT Transmission Seal Cover #TOP 3
Subaru O-Ring CVT Transmission Seal
ftb score rating icon 9.6

Top 10 Transmission Seals & O-Rings

#TOP 1

Captain O-Ring #11105 Orange O-Ring 50 Pack

11105
Orange
Captain O-Ring #11105 Orange O-Ring 50 Pack Cover
50 Pack - #11105 O-Ring Replacement for Harley Davidson Oil Drain Plug Oring (Orange Color)

The Captain O-Ring 50 Pack offers you a convenient supply of 50 orange #11105 o-rings designed for Harley Davidson oil drain plugs. These o-rings fit all three key drain plugs on your bike: the engine crankcase, transmission, and primary drain plugs, making replacement easier and more straightforward. By swapping out your old o-ring during every oil change, you can help prevent leaks and keep your bike running smoothly. Made from high-quality OEM material, these o-rings are built to last and feature a vivid orange color molded throughout, not just on the surface, so you get durability and the recognizable look you expect.

What We Like
Fits multiple Harley plugs
Pack of 50 o-rings
Durable OEM material
Leak prevention
Bright orange color
#TOP 2

OMT 826pc Universal O Ring Assortment Kit

OMTORKSM02
red & blue case
SAE + Metric
OMT 826pc Universal O Ring Assortment Kit Cover
Orion Motor Tech 826pc Universal O Ring Assortment Kit – Nitrile Rubber O Rings in 32 SAE & Metric Sizes for Automotive & Plumbing Repairs

The OMT 826pc Universal O Ring Assortment Kit comes with 407 SAE O-rings and 419 metric O-rings in 32 sizes, covering inner diameters from 3 to 50mm and outer diameters from 6 to 57mm. Made of top-class nitrile rubber, this O-ring set is durable and can withstand heat, corrosion, and wear. It is suitable for repairing cars, faucets, pipes, hydraulics, pneumatic machines, and more. The SAE and metric sets each come in separate cases with slots labeled by size, making it easy to organize, use, and store.

What We Like
Comes with a large assortment of 826 O-rings in 32 sizes
Made of durable and long-lasting nitrile rubber
Includes separate cases for easy organization and storage
#TOP 3

Subaru O-Ring CVT Transmission Seal

806912200
Subaru O-Ring CVT Transmission Seal Cover
Subaru 806912200 O-Ring (12.3X2.4) CVT Transmission Control Valve Seal Fits Crosstrek, Forester, Impreza, Legacy, Outback

Subaru O-Ring Seal for CVT transmission is designed specifically for Crosstrek, Forester, Impreza, and Legacy models. This seal ensures a tight fit for the control valve, preventing leaks and maintaining optimal transmission performance. With this O-Ring Seal, you can trust in the reliability and durability that Subaru offers, keeping your vehicle running smoothly. It is a crucial component to secure your transmission, providing peace of mind while driving.

What We Like
Optimal transmission performance
Prevents leaks
Ensures tight fit
#TOP 4

Subaru Variable Control Valve O-Ring 806944060

806944060
Subaru Variable Control Valve O-Ring 806944060 Cover
Subaru 2011-2025 Variable Control Valve O-Ring WRX Forester Ascent BRZ Crosstrek Impreza Outback WRX Legacy 806944060 Genuine OEM

The Subaru Control Valve O-Ring is designed to ensure a tight seal for the variable control valve in your vehicle’s transmission system. As a genuine Subaru part, it guarantees compatibility and reliable performance for models like the Ascent, BRZ, Crosstrek, and Impreza from various years. This seal helps prevent leaks, maintaining optimal transmission function and protecting your engine components. By using this original part, you benefit from a precise fit and durable material, which helps extend the life of your car’s transmission system and keeps it running smoothly.

What We Like
Genuine Subaru part
Compatible with multiple models
Prevents transmission leaks
Durable and reliable seal
#TOP 5

GM Genuine Parts Camshaft Position Solenoid O-Ring

55592715
Black
1 Count (Pack of 1)
GM Genuine Parts Camshaft Position Solenoid O-Ring Cover
GM Genuine Parts 55592715 Camshaft Position Solenoid O-Ring

This German-made GM Genuine Parts Camshaft Position Solenoid O-Ring comes with a package that has a length of 0.762 cm, height of 5.384 cm, and width of 5.384 cm. It belongs to the category of Transmission Seals & O-Rings.

What We Like
High-quality German manufacturing
Compact package for easy storage and transport
Designed for camshaft position solenoid
#TOP 6

Honda O-Ring for Transmission Seals & O-Rings

91301-P8A-A00
black
Honda O-Ring for Transmission Seals & O-Rings Cover
Honda 91301-P8A-A00 O-Ring (48.5X2.4); 91301P8AA00 Made by Honda

This genuine Acura part is designed to fit your specific vehicle, serving as a front engine camshaft seal. Its part number is 91301P8AA00, and it's manufactured to meet specifications for fit, form, and function. This o-ring is ideal for those looking for a reliable replacement part that can ensure seamless transmission operation.

What We Like
Designed to fit your specific vehicle
Manufactured to meet specifications for fit, form, and function
Reliable replacement part
#TOP 7

ACDelco GM Original Equipment PF2260G Engine Oil Filter and Cap Seal (O-Ring)

PF2260G
ACDelco GM Original Equipment PF2260G Engine Oil Filter and Cap Seal (O-Ring) Cover
ACDelco GM Original Equipment PF2260G (19301505) Engine Oil Filter and Cap Seal (O-Ring)

The ACDelco GM Original Equipment PF2260G Engine Oil Filter and Cap Seal (O-Ring) is designed to protect engine hydraulic components by filtering out abrasive particles. It is engineered and tested to meet rigorous standards and is backed by General Motors, with regular updates to production and service part designs.

What We Like
Helps keep abrasive particles away from engine hydraulic components
Designed, engineered and tested to rigorous standards
Backed by General Motors
GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
Regular updates to production and service part designs
#TOP 8

Motoforti Power Steering Pump O-Ring Set for Honda Accord

fmoto240807007148
Black, Red
0.71"
Motoforti Power Steering Pump O-Ring Set for Honda Accord Cover
Motoforti Power Steering Pump O-Ring Inlet Outlet Seals Connector Gasket Fit for Honda Accord - Pack of 4 Black Red Long-lasting

The Motoforti Steering Pump O-Rings are designed to fit a wide range of Honda models, including Accord, CR-V, Civic, and more, making it a versatile choice for many owners. These seals correspond to original equipment numbers, ensuring a precise and reliable fit for your vehicle. Installation is straightforward, so you can replace worn gaskets quickly without hassle. Using these replacement O-rings helps prevent oil leaks caused by old, flattened gaskets, keeping your engine dry and maintaining proper VTEC function. This set includes four pieces, providing everything you need to fix common steering pump seal issues.

What We Like
Wide Honda model compatibility
OE number accuracy
Easy installation
Prevents oil leaks
Complete 4-piece set
#TOP 9

Genuine Subaru Water Transfer Pipe O-Ring Set

806933080
Genuine Subaru Water Transfer Pipe O-Ring Set Cover
Subaru Impreza WRX STi Turbo Forester Outback Impreza Water Transfer Crossover Pipe O-Ring Set of 2 806933010 Genuine

The Genuine Subaru Water Transfer Pipe O-Ring Set is a set of two Orings for your Subaru vehicle. These Orings fit various 1993-2019 models such as Impreza, WRX, STI, Forester, Outback, Crosstrek, Legacy, BRZ, and Baja. Although these Orings come in bulk bags of 5 from Subaru and may not have the part number, they are genuine. These Orings are perfect for ensuring a proper seal on your water crossover pipe.

What We Like
Fits various Subaru models from 1993-2019
Ensures proper seal on water crossover pipe
Genuine Subaru parts
#TOP 10

ACDelco GM Original Equipment 24236927

24236927
ACDelco GM Original Equipment 24236927 Cover
GM Genuine Parts 24236927 Automatic Transmission Service Seal Kit

This Automatic Transmission Service Seal Kit by ACDelco is a recommended replacement part for your GM vehicle's original factory component. The product offers the same quality, reliability, and durability as the GM OE. The kit is manufactured to GM OE specification for fit, form, and function, ensuring that it is compatible with your vehicle's transmission.

What We Like
High-quality replacement part
Reliable and durable
Manufactured to GM OE specification
Buying Guide Image

Frequently Asked Questions (FAQs)

1. What happens when the O-ring goes bad?

When an O-ring goes bad, it may exhibit blisters, pits, or pocks on its surface. This can be caused by the absorption of gas at high pressure, which leads to rapid pressure changes. The absorbed gas can create blisters and rupture the elastomer surface when the pressure is rapidly removed.

2. Can a bad O-ring cause a leak?

Yes, a bad O-ring can cause a leak. If the inner diameter of the O-ring is too big, it will fit loosely over the parts it is meant to seal. This can result in pressurized gases or liquids leaking through the O-ring, compromising its sealing capabilities.

3. What is the most common cause of O-ring failure?

The most common cause of O-ring failure is a combination of several environmental factors. Improper gland design, which allows for too much or too little compression, is a common cause. Additionally, not providing enough space for the O-ring to expand and tolerance stack-up can contribute to failure.

4. Do O-rings stop leaks?

Yes, O-rings are commonly used to seal joins between separate parts, such as pumps, cylinders, connectors, and valves. They help prevent the leaking of fluids and gases, ensuring a secure and reliable seal.

Editor's Notes

During our transmission seals & o-ring research, we found 24 transmission seals & o-ring products and shortlisted 10 quality products. We collected and analyzed 37,519 customer reviews through our big data system to write the transmission seals & o-rings list. We found that most customers choose transmission seals & o-rings with an average price of $6.78.

The transmission seals & o-rings are available for purchase. We have researched hundreds of brands and picked the top brands of transmission seals & o-rings, including Captain O-Ring, Orion Motor Tech, Subaru, GM GENUINE PARTS, Honda. The seller of top 1 product has received honest feedback from 682 consumers with an average rating of 4.9.

Written by
Robert Reyes Avatar

Robert Reyes is a dedicated writer from San Francisco with a bachelor of degree in mechanics and a bachelor of degree in marketing. He focuses on making some complicated topics simple and enjoys explaining complex and technical things in an easy-to-understand way.