Industrial WD-304 Liquid Line Refrigerant Filter Drier

The Watsco WD-304 Liquid Line Refrigerant Filter Drier is a 1/2 in. SAE flare device designed to remove moisture, acids, and contaminants from the refrigerant circuit, helping protect compressors and other critical components in refrigeration and air conditioning systems. Intended for liquid-line installation with a 1/2 in. flare connection, it supports reliable operation and longer system life across residential and commercial applications. This filter drier is commonly installed in commercial HVAC equipment, walk-in coolers, refrigerated display cases, heat pumps, condensing units, and industrial refrigeration equipment, where maintaining clean refrigerant flow is essential. It is geared toward replacement, retrofit, preventive maintenance, and refrigeration system repairs by maintenance technicians, HVAC contractors, and OEM service providers. The WD-304 features heavy-duty sealed construction for dependable operation in HVAC and refrigeration service environments and has common replacements such as WD-303, Sporlan C-304-S, and Emerson EK-304S.