This little piece basically joins two sections of air brake line together. Think of it like a connector, but specifically for air lines. Both ends have male fittings – that means they have threads sticking out – and it screws onto two corresponding female ends. It creates a secure, airtight seal so the air pressure can flow where it needs to. It's part of your truck or trailer’s air brake system, which, obviously, is crucial for stopping. You’ll find these unions in various places along the air lines – anywhere two sections need connecting. It might be connecting lines to the air dryer, the leveling valves, or the brake chambers themselves. It’s not a glamorous part, but it’s absolutely essential. If one of these unions leaks, or fails completely, you’ll lose air pressure in part of your braking system. You’ll notice if you’re losing pressure because your gauges will drop, and that's a serious safety issue. It acts like a shield protecting the integrity of your entire air brake line. A leak means reduced stopping power, and nobody wants that. They’re pretty inexpensive to replace, so it's best to address them right away. We carry a good selection of these at Fixparts Online, and honestly, it's one of those parts you always want to have a spare of, just in case. Choose quality: Double Male Union (MPN 8931011644) is backed by a 12-month warranty!

About Wabco

WABCO specializes in air braking systems, EBS, ABS, ADAS, and trailer control systems.

Why Choose Wabco?

• Wabco parts are known for lasting a long time, so you won't have to replace them as often. • We have a huge selection of parts, covering many different makes and models of vehicles. • Our parts are made to meet or beat the quality of original equipment, without the high price tag. • Wabco has been a trusted name in auto parts for years, with a reputation for reliability and performance. Performance you can rely on – Wabco parts from FixParts Online.