The Engine Coolant Thermostat Housing O-Ring by Fel-Pro is a high-quality factory replacement part designed specifically for the 4Runner, Tacoma, and more. This O-Ring is essential for maintaining proper sealing and preventing leaks in the engine coolant system. With interchange part numbers such as 112711, 9676135031, C31213, and WO8641, this product ensures a perfect fit and reliable performance. Made by the trusted manufacturer Fel-Pro, this O-Ring is a single piece that includes the necessary components for a professional installation.