ProSolv® Replacement Carbon FilterReplacement filter traps VOCs released when using your ProSolv. One piece replacement cartridge threads directly into ProSolv unit without special tools Helps remove Volatile Organic Compounds (VOCs) from propellant Replace filter after 40 uses which can be tracked with the 40 certification tags included Use With ProSolv Propane Cylinder Recycling System Brand Justrite ProSolv Category Propane Recycler Replacement Filter Sold as 1 each Weight 2. 43