This is the seal that fits in between the master cylinder and the reservoir. very necessary when replacing either to keep the system from sucking air.
Known as: sealing plug
No more lost or dropped spark plugs. Plugs go where you want them with the magnetic or lock-grip spark plug socket. Spark plug removal and installation is safer and easier. For use with a 3/8" ratchet. Fits all standard Bosch plugs, does not fit beru 3-prong plugs.
Ngk iridium ix plugs offer more durability and a higher melting point compared to platinum plugs, better center electrode anti-oxidation and anti-erosion, improved ignition, superior anti-fouling, lower required voltage, new metal shell plating process for better anti-corrosion. Sold each.