It is used for air injection. Since it strikes the cover when an upright type is installed, it is using this melb whose L-shaped head still has a low height. It would be even better if there is a mold type of the same type as this type.
Water leakage occurred as it seemed that the sealant had deteriorated, because storage was bad. I bought four, but all is bad. The person with white (FR 6 - 02 MLW) had no problem. It is because white is not in stock because it is out of stock.