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. You'll find the RFL2 Replacement Filter and O-ring pack at your favorite Fieldpiece distributor.
Warning: this product contains a chemical known to the State of California to cause cancer. P65Warnings.ca.gov