LiquaGen Pack of 5 Inline Carbon Filters for Reverse Osmosis Applications (2" x 10") - 1/4" Inlets High Consistency Melt Blow Polypropylene 1/4" fittings not included. Specifications: 5 Micron Rating: 1 Nominal Female Nipple Pipe Thread (NPT): 1/4" Dimensions: 10 5/8" x 2" Weight: 13 oz Operation Temperature: 40F to 125F Filter Life: 1,500 Gallons; Recommended filter change once a year. Filter Media: Coconut Base Carbon