411 Series Hose Ends are a push on hose end for use with standard style hose and a hose clamp for securing. As an example, these are great for adapting aftermarket pumps and fuel rails to standard fuel hose. 421-01-04 421-02-03 421-02-04 421-02-05 421-02-06 421-04-05 421-04-06 421-06-05 241-06-06 421-06-08 421-01-04-BLK 421-02-03-BLK 421-02-04-BLK 421-02-05-BLK 421-02-06-BLK 421-04-05-BLK 421-04-06-BLK 421-06-05-BLK 241-06-06-BLK 421-06-08-BLK