Costguard's CGS-20 housing is manufactured of durable polypropylene and has excellent chemical resistance. The Costguard CGS20 is a 20-inch low profile Slim-Line single bowl housing. The Costguard CGS-20 Single Housing System includes water pressure gauge, wall mounting bracket and hardware for fast, easy installation. The CGS-20 is also equipped with a pressure relief button to relieve water pressure during cartridge changes. CGS-20 System is shipped fully assembled. Cartridge sold separately. Choose the appropriate 20-Inch cartridge for your needs. The Costguard CGS20 Bowl housing assembly accepts drop in cartridges of standard size that fit most 20-Inch Slim-Line design systems. Everpure part number DEV9100-20 or DEV910020.