Small ID HVAC Heater Hose (86800) by Dayco®. 90 Degree. Position: Passenger Side. Length: 8 1/4″. This small diameter heater hose is manufactured with the knitted reinforcement and EPDM construction, which ensures exceptional durability and high resistance to temperature variations up to +257F. For applications with a quick-connect end, the hose is built with a quick connect assembled onto it, which ensures easy and convenient installation.