Master 4103.875 filtre à carburant b 70

The Master 4103.875 fuel filter b 70, listed under catalogue article 696.874.009, is a component used in the gas supply line of air heaters and similar combustion appliances. Parts of this type are installed between the gas meter or supply pipe and the gas valve. Their function is to trap solid particles, pipe scale, or other debris that could interfere with the gas valve’s sealing surfaces or block the burner’s injectors. A clean fuel supply is essential for reliable ignition, stable modulation, and consistent combustion. When selecting a replacement filter of this type, the key parameters are the pipe connection size (typically threaded or flanged), the flow capacity relative to the appliance’s maximum gas throughput, and the filter mesh grade (usually expressed in microns). The model number often indicates the body size and the series, but specific dimensions and ratings should be verified against the existing part. For air heaters, the filter is normally located near the appliance, often ahead of the gas pressure switch and the valve train. When servicing an air heater, inspect the filter element for clogging or corrosion. A dirty filter can cause low gas pressure at the valve, leading to poor combustion or lockout. Replacement should use a filter of the same connection size and flow rating. Always check the gas pressure at the valve inlet after replacing the filter to confirm no additional restriction has been introduced.