Symmons S-4702-Trm Allura Tub/Shower Trim In Chrome, Chrome A piston-style pressure-balancing valve equalizes the hot and cold water pressure as other demands are made on the plumbing system Single-handle design for quick and easy water control with a single lever Compatible with the Symmons Temptrol valve. (Valve not included) Limited lifetime homeowner warranty A piston-style pressure-balancing valve equalizes the hot and cold water pressure as other demands are made on the plumbing system Single-handle design for quick and easy water control with a single lever For use with the Symmons Temptrol valve. Valve not included Limited lifetime homeowner warranty