【High Quality】 Tektall upper coolant housing built in filler hose made of 100% Billet Aluminum, Well CNC Machined, Accurate, Good finishing to ensure the Durability and the reliability. 【Fitment】 Upper Coolant Housing Built In Filler Hose For K20A, K20A2, K20A3, K20Z1, K24A1 cylinder heads. Acu-ra Rsx Si. 【Function】 The filler neck comes off the top of the housing and can be used to relocate the radiator cap to a higher point on the engine itself. The Filler Neck is also available with standard 1.25" hose or in 12AN and 16AN sizes and was designed for use with an OEM 92-00 Honda Civic radiator cap. This part will be very helpful on an engine that already has a bad reputation for coolant bleeding. 【Please Note】 Please check that the picture matches before purchase. Does not fit with PRB manifold and throttle bodies with cruise control. Tektall K Series Upper Coolant Housing Built In Filler Hose K20 K24A1 Rsx Si