Everpure EV9272-22 QC7I Twin Parallel Filter Head Built-in water shut off valve and flushing valve makes cartridge change outs easy A cartridge nesting feature provides a more secure and durable fit Includes mounting box bracket and screws for fast and easy installation. No extra mounting plate is required Built-in water pressure gauge helps monitor proper flow All wetted parts have passed NSF extraction tests, Engineered for durability, strength and longevity. Will not corrode