Thank you for your question, Geo64! The RP70719 1.80 gpm @ 60 psi is the standard aerator for the 400-DST model. A 2.5 gpm aerator may not fit however this model will accept 5/16"-27 Male thread aerators and another may be found at plumbing supplier. Please check with current water legislation in your area first.
Best regards, Edward
Date published: 2019-07-21