Plumbing or air line project? This 10-pack of 90-degree elbow fittings will make your life easier. These are brass, 90-degree angle elbows with a 1/4-inch compression fitting on one end (for your plastic or soft metal tubing) and a 1/4-inch male pipe thread (NPT) on the other end. They're part of the Poly-Tite line, designed specifically for use with thermoplastic tubing. They have a machined-in tube support and a black acetal copolymer sleeve to get a good seal without crushing your tubing. The knurled nut makes it easy to tighten by hand before giving it a final snug turn with a wrench. They're rated for up to 150 PSI and temps from 0 to 150°F, so they're great for low-pressure air lines, water lines, or fuel lines on small engines. Having a pack of 10 means you've got spares for your current project and future fixes. Super handy for routing lines in tight spaces where a straight fitting won't work. Just make sure your tubing and thread sizes match (1/4\ for both).