This Hydro Guard HDG-P117 carbon filter is an alternative comparable replacement to the AP-117 AP117. It has a particle retention size of 5 microns, and is suitable for drinking water filtration applications. Made from NSF Certified Coconut Granular Activated Carbon (GAC), this filter removes and reduces Chlorine, taste and odor from your drinking water. It has a 2.5" outside diameter (OD), an overall length of 10", and an operating temperature range of 48 to 100 degrees F.