Thank you for your question, Sandi! The Delta model 4140-DST has a flow rate of 1.80 gpm @ 60 psi, 6.8 L/min @ 414 kPa. We do not offer a way to increase the flow rate and modifying the model in any way will void the warranty as well as possibly damage this part, however, if you are getting less than 1.8 GPM, please check for debris between the sprayer and the hose.
Best regards, Edward
Date published: 2018-06-27