Master Fuel filter 4103.875

The Master 4103.875 fuel filter is a gas-supply component for Master air heaters. It removes solid particles and scale from the fuel, protecting the gas valve and injectors. Designed for gas operation, it suits both professional and home use. Installation and replacement are straightforward, and the materials withstand fuel and high temperatures.

Filters of this type are selected by matching the connection size, flow rating, and mesh grade to the appliance and existing pipework. Before ordering, compare these specifications with the original filter and verify the body dimensions, as the model number alone is not sufficient. Fit the filter in the gas supply line ahead of the pressure switch and valve train, using the same orientation as the old filter. After installation, measure gas pressure at the valve inlet to confirm there is no added restriction.

Clogging or corrosion of the filter element restricts gas flow, lowering pressure at the gas valve. This can cause poor combustion, an unstable flame, or safety lockout. When such problems occur, inspect the filter for accumulated debris or rust, and replace it if contaminated.