These dishwasher air gaps are constructed of polyethylene and come with chrome finished caps. They are easy to install, and are UPC and IAPMO approved.•Typically for use with dishwashers to vent water or air•Constructed of mold injected white polyethylene•The cap comes in a chrome finish•Each package contains 2 dishwasher air gap and chrome caps•These are both UPC and IAPMO approved•Lock nuts on the tube are used to secure the tube to your sink and used to adjust the height of your dishwasher air gap•Easy to install•Can be installed with a few basic tools (adjustable or close quarter basin wrench)