22mm black rubber EPDM car heater hose is a type of flexible hose that is commonly used in automotive applications as a heater hose. The hose is made of black EPDM rubber, which is a type of synthetic rubber that is known for its durability and resistance to heat, ozone, and chemicals. The 22mm inner diameter of the hose makes it suitable for use in vehicles with a standard heater system. Black rubber EPDM hoses are commonly used in automotive applications because they are flexible and durable, and can withstand the high temperatures and pressures present in a vehicle's cooling system.