This is the Radium Engineering 10AN PCV Valve Cover Adapter. This fitting features 10AN male (7/8-14) threads and has a large 12.4mm 1/2" internal diameter for optimal flow. This aluminum fitting can be used as a weld-in or a press-in fitting, and the press-in side of the fitting is 16.6mm in diameter. 

Radium 10AN Male Bung Press-In and Weld-In

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SPECS:

• Durable aluminum construction
• 10AN male (7/8-14) threads
• Large 12.4mm 1/2" internal diameter for optimal flow
• Can be used as a weld-in or a press-in fitting especially for the magnesium valve covers found on the Mitsubishi Evo 8 and 9 models
• It replaces the PCV valve's bushing so installation does not require valve cover removal
• The fitting has extremely close tolerances to make a tight fit
• The press-in side of the fitting is 16.6mm in diameter