Worcester 26 CDI Xtra Charging Filling Loop Key 87161211070 Small & Large Keys

Product Overview

The Worcester Bosch Charging Filling Loop Key Set (Part Number: 87161211070) is a replacement filling accessory designed for selected Worcester Bosch boiler systems.

This set includes one large and one small filling key, used with the appropriate boiler charging link mechanism to allow the sealed central heating system to be refilled and repressurised when required.

The filling keys provide access to the boiler's filling mechanism, helping users maintain the correct heating system pressure in accordance with the manufacturer's instructions.

ℹ️ Product Condition Options:

This part may be available in New or Refurbished condition. Please select your desired option from the dropdown menu above. Refurbished keys should be inspected for damage and correct operation before use.

Technical Insight & Common Failure Symptoms

The Worcester Bosch filling keys are manually operated accessories used with the boiler's charging link assembly. They allow water to be introduced into the sealed central heating circuit when system pressure requires adjustment.

Unlike an electronic boiler component, the filling keys do not control heating operation or regulate pressure automatically.

Common situations where replacement filling keys may be required include:

• Original filling keys missing or lost.

• Existing filling keys damaged or broken.

• Worn keys preventing correct engagement with the filling mechanism.

• Difficulty inserting or locking the filling key into position.

• Unable to operate the charging link because the correct key is unavailable.

• Replacement keys required during boiler maintenance or servicing.

Replacing missing or damaged filling keys can restore access to the boiler's filling mechanism. However, replacement keys will not resolve underlying system pressure loss, which may be caused by leaks, expansion vessel problems or other heating system faults.

Compatibility

This filling key set (MPN: 87161211070) is designed for selected Worcester Bosch boiler systems, including the Worcester 24, 28 and 35 CDi Mk2 ranges.

The set contains:

• 1 × Large Filling Key

• 1 × Small Filling Key

Please verify the boiler model, filling link arrangement and part number against the manufacturer's technical documentation before ordering to ensure correct fitment.

Safety Advice

Boiler filling keys must only be used in accordance with the manufacturer's operating instructions. Ensure the correct filling key is securely fitted and monitor the boiler pressure gauge carefully when repressurising the heating system.

Do not overpressurise the heating circuit. If the system repeatedly loses pressure, the filling mechanism leaks or the keys cannot be operated correctly, seek assistance from a suitably qualified heating engineer. Any repairs involving internal boiler components must be carried out by an appropriately competent professional.