Polyester Felt filtration bag Size #1. This Bag size fits all Standard Length filtration system housings, including systems by Quantrol, Eaton, FSI, GAF, Pentair, Rosedale, and Strainrite.  Size #2 is a 7" x 16" bag. Quantrol Bag filters are designed to universally meet all your filtration needs across a wide range of housing systems. Available in cases of 50.  Available Micron Rating: 5, 25, 50