Vaillant O Ring 98-1157 x10 981157

O Ring Set Pkt of 10

Genuine Vaillant Seal Kit | For Boilers and Heating Components

Product Overview
The Vaillant O-Ring 98-1157 (Part No. 981157) is a genuine OEM sealing ring set, supplied in a pack of 10, designed for use across a wide range of Vaillant boilers and heating system components. These high-quality rubber O-rings provide a secure, watertight seal for joints and fittings exposed to heating pressure and temperature variations, ensuring long-lasting system integrity and leak prevention.

Manufactured from heat- and chemical-resistant elastomer, each O-ring maintains flexibility and performance under demanding boiler conditions. Ideal for engineers and service professionals, this pack provides reliable replacements during routine maintenance or component replacement.

Key Features

• Genuine Vaillant O-Ring Set – Part No. 98-1157 / 981157

• Supplied as a pack of 10 replacement seals

• Provides leak-free sealing for boiler and heating joints

• Made from high-quality, heat- and oil-resistant rubber

• Maintains pressure integrity and long-term flexibility

• Suitable for domestic and light commercial Vaillant systems

• OEM-quality fitment – ensures proper sealing performance

• Recommended for service engineers and boiler maintenance kits

Compatibility

• Compatible with multiple Vaillant boiler ranges including ecoTEC, TURBOmax, and ecoMAX models

• Used for hydraulic components, pump housings, manifolds, and unions

• Suitable for both heating and hot water circuits

When to Replace

• If leakage occurs at a joint or fitting

• During boiler servicing or component replacement

• When the existing O-ring appears cracked, flattened, or worn

Technical Specifications

• Manufacturer: Vaillant

• Part Number: 98-1157 / 981157

• Quantity: Pack of 10

• Material: Heat- and oil-resistant elastomer

• Type: O-ring sealing gasket

• Function: Provides watertight seal for heating components

• Application: Vaillant boilers and hydronic systems