The Fieldpiece PFL2 is a pack of replacement filters and o-rings 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.
California residents see
Warning: This product can expose you to chemicals including Bisphenol A (BPA) which is known to the State of California to cause Harm.