Clamp cap type is used to manage tightening torque of intake hose at the factory.
When clamp cap is tightened by 0.5 ~ 0.7 kgf.m, the head of clamp cap is cut.
Using a pliers, Take off the cap.
☞ After it removed, there will be another (-) cap which you can use a (-) driver.
Do NOT reuse the clamp cap which is removed.