The XDP Aluminum Air Bleeder Screw XD129 is a quick and simple solution for replacing your weak plastic factory screw. Unlike the factory screw that will round off or break in cold weather the XDP Aluminum Air Bleeder Screw is made of T6 billet aluminum. Features: Includes OE Quality O-RingMade From Anodized T6 Billet AluminumSlotted To Work With Aftermarket WrenchesMachined Air Channel On Threads To Bleed Air