So these fuel line connectors are specifically designed for Yamaha outboard motors - they're the 6mm size (that's 1/4 inch, not 3/8 inch, so make sure that's what you need). You get three pieces in the pack: two female connectors for the tank side (fits part numbers 6Y1-24305-06-00, 6Y1-24305-05-00, 6Y1-24305-04) and one male connector for the engine side (fits 6G1-24304-02-00, 6G1-24304-01, 6G1-24304-10-00). They're made from aluminum and ABS materials, which means they're rust-resistant, can handle high temperatures, and are lightweight but still durable. Installation is straightforward - the size is accurate so you can directly replace your old or broken connectors without any modifications. The integrated seal provides really good tightness to prevent fuel leaks, which is obviously crucial when you're dealing with fuel systems. These are specifically for fuel feed lines on outboard motors. Super handy to have as spares in your marine toolkit, especially if you do your own maintenance. They just make fuel line repairs and replacements so much easier.