Hi John,
Thank you for your review of the Delta Faucet Single Handle Floor Mount Tub Filler Trim MODEL#: T4759-FL. Please accept our sincere apology for the inconvenience you are experiencing. We are always happy to assist. Quality is very important to us and our products undergo rigorous testing to ensure high-quality performance.
It is possible that flushing the product could resolve this issue. To do this, turn off the water supplies, remove the cartridge, and turn the supplies back on for one minute.
Please make sure that you are getting good flow through both the hot and cold sides while flushing. You can also shake the cartridge back and forth to make sure the back half of the cartridge rattles. This means that the pressure-balancing spool is moving freely, as it should. If you would like installation help, you may contact our residential warranty line directly at 800-345-3358 (prompt 2, then 4).
We appreciate your business and look forward to continuing to serve you. Please contact us directly if you have any further questions.
Best Regards,
Kelley
Digital Communications Specialist