This unique hose is designed to work with K24 and straight upper coolant housing (coolant housing pointed straight towards radiator) and driver side or full radiators.
Requires K-Tuned K24 Upper Coolant Housing KUW-24S-HE or KUW-24-HOSE or KUW-24-258
Will work on
2006-11 Civic Si
2002-06 RSX / EP3 with K24 swap
EG/EK/DC2 w/K24 Swap - Will work with half rad in driver position or full RSX radiator. Please note you want to mount the radiator based on the hose.
Links to upper coolant housings are below