Whether you decide on a 2 micron element, a 10 micron element, or a 30 micron element for your Primary Racor filter element, you may want to consider the benefits of increasing from the R15 canister size to the R20 size. They each screw into the 215R housing. The R20 is 0.7″ deeper but offers more filtering area and 25% more dirt retention than the R15 series for the same cost. If you still will have adequate access under filter to drain it, I’d consider installing the R20 element.