For cars, trucks, station wagons, vans and buses Efficient—heaters use warm engine coolant to heat vehicle as you drive Easy to install! Some drilling and/or cutting required. Instructions included. 5/8" heater hose required for installation (sold separately; 6-ft. hose SKU# ZX811052B, 50-ft. hose SKU# ZX380876R). Required installation kit sold separately (SKU# ZX159611Y). Click on item SKU# for additional information.