Vaillant Gasket, C-Type Pk10 178969

Vaillant Gasket, C-Type Pk10 178969

The Vaillant C-Type Gasket (Part No. 178969) is a specialist fiber sealing washer used across various hydraulic connections in the Vaillant boiler range. This genuine OEM part is designed to provide a high-pressure, watertight seal for 3/4" (three-quarter inch) threaded unions and flat-faced pipe connections. Supplied in a Pack of 10, it is an essential service item for heating engineers to ensure leak-free maintenance and part replacement.

Key Features and Specifications
Fiber Construction: Manufactured from high-density, heat-resistant fiber material that expands slightly when in contact with water to create a robust, permanent seal.

C-Type Profile: Specifically sized for 3/4" BSP flat-faced connections, commonly found on main heat exchangers, pump housings, and gas valves.

High Thermal Stability: Engineered to withstand the constant temperature fluctuations of primary heating water without becoming brittle or failing.

Genuine Vaillant Part: Ensures the exact thickness and diameter required for Vaillant hydraulic blocks, preventing over-tightening or damage to plastic components.

Quantity: Convenient Pack of 10, ideal for keeping in a service kit for multiple jobs.

Common Applications
This gasket is one of the most versatile seals in the Vaillant catalog. It is primarily used for:

Main Heat Exchanger Connections: Sealing the flow and return pipes to the heat exchanger body.

DHW Heat Exchanger: Fixing the secondary plate heat exchanger to the hydraulic block.

Pump Unions: Sealing the inlet and outlet of the internal circulating pump.

Gas Valve Connections: Ensuring a gas-tight seal on specific manifold connections (where a fiber washer is specified).

Boiler Compatibility
The 178969 gasket is a universal spare found in almost all modern and legacy Vaillant boilers, including:

ecoTEC Plus & Pro: 612, 615, 618, 624, 630, 637, 824, 831, 837.

ecoFIT Pure: 612, 615, 618, 625, 630, 825, 830, 835.

TURBOmax / THERMOcompact: Various older models.

Installer Tip: Always ensure the old gasket material is completely cleaned off the flat face of the union before fitting the new 178969. Do not use jointing compound (plumber's mate) on these fiber washers, as they are designed to seal through compression alone.

Essential Companion Products
To complete a hydraulic service or heat exchanger replacement, the following items are often used:

Direct Product Link: Vaillant Gasket C-Type Pk10 - 178969

Heat Exchanger Replacement: Vaillant DHW Heat Exchanger - 178973

Water Pressure Check: Vaillant Pressure Sensor - 0020059717

Specialist Support and Local Collection
Are you replacing a plate heat exchanger or a pump and need to ensure you have the correct number of seals? Our trade counter team can advise on the exact gasket requirements for your specific repair.

Visit our trade counter and Bathroom Showroom at 61 Fullers Road, E18 2QB for expert technical advice and quick access to genuine Vaillant spares.