We do not stock the Q5440 filter. Email firstname.lastname@example.org
or call 1-888-801-7873 if you would like to special order the Q5440. An alternative option is the Q5640 filter below. The Q5640 is a 12" version of the Q5440 filter. The Q5640 has the same contaminant reduction as the Q5440. If you need an 8" filter, the Q5486 filter below is stocked and has additional contaminant reduction. The Q5486 carbon is GAC and not coconut carbon like the Q5440. All of these alternatives will fit in the filter head used by the Q5440.