Edelbrock/Russell 662060 Blue Anodized Aluminum 3/8" Allen Socket Pipe Plug Precision machined to ensure precise thread engagement Lightweight aluminum fittings are designed to match up with all Russell performance hose and hose ends 37 degree sealing angle guarantees a positive seal at maximum operating pressures Pipe size is 1/2" Provides maximum protection against corrosion and the ultimate in strength and appearance