Block Breather Adapter, Billet Aluminum, Threaded 3/4" NPT, Audi A3 1.8T (1996-2003) Original 034Motorsport product Make: Audi Model: A3 Year Range: 1996-2003 034Motorsport/s billet aluminum block breather adapter for the 1.8T is precision CNC machined in-house to ensure unsurpassed quality and perfect fitment. Now available with a 3/4" NPT provision. Available Options: Threaded Block Breather Adapter - Simply replace the stock hose and have a threaded 3/4" NPT fitting ready to go to virtually any fitting you choose. Perfect for using braided AN lines and installing custom catch can kits.