6an male o-ring boss port plug seal nut block off cap aluminum fuel fitting adapter hex plugs with an-06 orb black autobbox aluminum block off cap with oring seal fittings an male nut straight thread hexagon head port plug adaptor<br> comes in different sizes. pls contact us for more product information<br><br> features:<br> <li>more area and smoother transitions from the inlet to the outlet, resulting in less restriction than any other fitting line</li><li> adapter style: male an hex plug with o-ring adapter</li><li> male an hex plug with o-ring</li><li> aluminum port plug adapter with o-ring seal is made of blue anodized aluminum construction and it is available for any plumbing situation and many custom applications</li><li> manufactured from aircraft quality aluminum that is lightweight but durable.</li><li> precision high performance fittings and adapters are fully compatible with gasoline and alcohol based fuels</li><li>screws into female 6 an fitting<br><br> notes:<br> professional installer is highly recommend, no installation instruction included.