The Filter Driers & Sight Glasses category includes the critical protection and diagnostic components that ensure refrigerant circuits stay clean, dry and fully charged. Filter driers remove moisture, acid and particulate contamination, while sight glasses provide a clear indication of refrigerant condition and flow.
Here you’ll find liquid-line and suction-line filter driers, bi-flow driers for heat pumps, replaceable-core driers, moisture indicator sight glasses, combination sight-glass/drier assemblies, sweat and flare models and OEM-compatible replacements. These components support A/C systems, heat pumps, VRF/VRV circuits, commercial refrigeration, walk-in boxes and ice machines.
When selecting filter driers and sight glasses, confirm refrigerant type (R410A, R32, R454B, R22, R134a, CO₂), connection size, flow capacity, pressure rating, orientation, and use-case (burnout repair, new install, retrofit). Proper filtration and clear diagnostics are essential for preventing restrictions, maintaining efficiency and protecting compressors.
Pro tip: After a burnout or major repair, use a high-capacity suction-line cleanup drier and replace it after 24–72 hours of operation to remove remaining acid and contaminants.
Filter driers and sight glasses including liquid-line driers, suction-line driers, bi-flow heat pump driers, replaceable-core driers and moisture-indicating sight glasses for HVAC and refrigeration equipment.
