4 Housings of 20 Inch big blue filter housing 1 inch NPTF in/out ports pressure release button and 1/8 inch pressure gauge hole and plug. Double O Ring 20 inch Big Blue. 1 inch inlet and outlet ports.Pressure release valve PLUS built in PLUS 1/8 inch PRESSURE GAUGE HOLE + Plug in case you would like to use it without gauge. Accepts 20 inch x 4.5 inch diameter cartridges. This item is in the category "Home & Garden\Kitchen, Dining & Bar\Small Kitchen Appliances\Water Purification\Water Filters".usa" and is located in this country: US. This item can be shipped to United States, all countries in Europe, Canada, Mexico, Japan, Australia, China, Korea, South, Indonesia, Taiwan, South Africa, Thailand, Hong Kong, Bahamas, Israel, New Zealand, Philippines, Singapore, Saudi Arabia, United Arab Emirates, Qatar, Kuwait, Bahrain, Malaysia, Brazil, Chile, Colombia, Costa Rica, Dominican Republic, Panama, Trinidad and Tobago, Guatemala, El Salvador, Honduras, Jamaica, Antigua and Barbuda, Aruba, Belize, Dominica, Grenada, Saint Kitts-Nevis, Saint Lucia, Montserrat, Turks and Caicos Islands, Barbados, Bangladesh, Bermuda, Brunei Darussalam, Bolivia, Ecuador, Egypt, French Guiana, Guadeloupe, Jordan, Cambodia, Cayman Islands, Sri Lanka, Macau, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Vietnam, Uruguay.