Dear AMD5052, thank you for your review of this product. I apologize for the issue that you have experienced and I am glad to help. The Monitor Valve protects from rapid changes in water temperature. This product is covered under a lifetime limited warranty. If you feel this is a warranty related issue, feel free to contact us directly and we will be glad to assist you. Best regards, Tyler
Phone: 1-800-345-3358 | Email: customerservice@deltafaucet.com | Facebook/Twitter: @deltafaucet