Crystal Quest Undersink Replaceable Double Multi Ultra Water Filter System Conveniently provides 20,000 gallons of water. (2-4 years, or when the flow of water will automatically either stop or slow down greatly.) Installs neatly under the sink. Comes with an attractive faucet and all necessary installation hardware. Please note: When considering installation, if current under sink plumbing is hard copper tubing the saddle valve would be used; for flex tubing the T-valve would be required. Saddle valve is sent with order unless T-valve is specified. Standard 1/4" connections; if 3/8" needed additional conversion package should be ordered Dimensions: 10"L x 14"H(10"+ 4" to change cartridge) x 5"W Operating Pressure: Min 20psi - Max 60psi(pounds per sq. in.) Operating Temperature: Min 40 degrees f Max 90 degrees f Max flow rate: .5 gallons per minute