Dear Henry,
Thank you for your question. The maximum flow rate of the Delta Classic Lavatory 520LF-WFMPU faucet model is 1.20 GPM at 60 PSI, because it comes with the 1.20 GPM aerator in it. The RP52216 is the 1.50 GPM aerator assembly that can be purchase separately, for this faucet, in some states.
Best regards,
Tanya
Answered by: Tanya
Date published: 2017-11-15