Hi Jeff,
We can help! The Venturi Bath faucet flows at a rate of 1.2 gallons per minute at 60 PSI. The faucet is also equipped with screens in the inlet adaptors #970-1129 to help prevent debris from flowing into your faucet. The maintenance guide has cleaning instructions to clear any loose debris that may have gotten caught up in the screens that could be restricting the flow. Below is a link to these steps; please refer to the 3rd page, then step “Adaptor Cleaning.” If cleaning the adaptor screens does not help, it could also be the cartridge that would need replacing. Please call us at 1-800-732-8238 if you have any questions or need further assistance, and we will be happy to help.
https://pfisterstorage.blob.core.windows.net/documents/pf_uc_lf049-vn_47366_p.pdf
Thank you,
Pfister