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45 years of trusted expertisePilot Assembly, Tubes, Injectors, Thermocouples & Interrupters
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Forming the core sensing and ignition loop on older and permanent pilot boilers, these replacement pilot assemblies, thermocouples, injectors, and interrupters ensure safe burner ignition and flame monitoring. Our range includes universal and original equipment manufacturer (OEM) components to help you restore domestic and commercial gas appliances safely and efficiently.
436517
UCP Capillary Pumped Loops Flexible Tube Black 080387
£14.78
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Maintaining and repairing standing pilot ignition systems requires reliable components that match original appliance specifications. A faulty thermocouple or blocked injector can prevent the main gas valve from energising, leading to pilot outages and system lockouts. This selection includes single thermocouples, complete pilot assemblies, precision-drilled gas injectors, and inline thermal interrupters designed for fast drop-in replacement on gas fires, back boilers, and traditional system boilers. Available with varying thread pitches, probe lengths, and millivolt outputs, these trade-grade spares allow gas engineers to carry out first-time fixes during routine servicing or breakdown calls. Stocking trusted OEM parts alongside multi-fit universal kits helps minimise downtime for end users while ensuring full compliance with appliance gas safety standards.
Frequently Asked Questions
How do I determine whether a boiler needs a universal thermocouple or a specific OEM part?
Universal thermocouples come supplied with various threaded adapters and split-nut fittings, making them suitable for a wide range of standard gas valves and older boilers where exact original parts may be obsolete. However, high-efficiency appliances, specific boiler lines, or system setups with built-in thermal cut-off interrupters often require an exact OEM replacement to ensure correct length, millivolt signal output, and physical seating within the pilot bracket. Always consult the appliance manufacturer handbook or check the part number against the existing component before selecting a replacement.
What is the function of an inline thermocouple interrupter?
An interrupter is a specialised fitting that installs into the thermocouple circuit to break the millivolt signal sent to the gas valve if a safety device is triggered. It acts as an interface for high-limit thermostats, flue gas spillage switches, or thermal cut-outs. If the connected safety device detects an unsafe operating condition, such as excessive heat or flue blockage, it opens the circuit, causing the thermocouple signal to drop and immediately shutting off the gas supply to the pilot burner.
Why is it essential to check injector sizing when replacing pilot components?
Pilot injectors feature precise orifice dimensions calibrated for either Natural Gas or Liquid Petroleum Gas (LPG). Installing an incorrect injector size will alter the gas flow rate, producing either an oversized, dirty flame that causes soot accumulation or a weak, unstable flame that fails to heat the thermocouple tip adequately. When replacing a pilot assembly or injector nozzle, verify that the gas type matches the property supply and that the orifice size matches the original manufacturer specification for proper flame pattern and reliable millivolt generation.