Fieldpiece filters and O-rings are designed to help protect your refrigerant leak detector sensor and keep it working properly. When the filter swells up and blocks water and other contaminants from reaching the sensor, it's done its job and it's time for a replacement. Note: oil drawn into the filter will block it almost instantly - replace for best performance.

Fieldpiece Filtered Tip, For Use With: DR58 Heated Diode and DR82 Infrared Refrigerant Leak Detectors