3/8" x 3/8" Tube x Tube Union Elbow

The John Guest 3/8" x 3/8" Union Elbow from Reliance Worldwide Corporation joins two equal-size 3/8" tubes at a 90-degree angle, letting you route water lines around corners without kinking the tubing or adding bulky junctions. It is a clean, reliable fitting for filtration and reverse osmosis plumbing where neat routing protects flow and keeps an installation serviceable.

Flexible tubing has a minimum bend radius, and forcing a tight turn can pinch the line and restrict flow, sometimes enough to starve a downstream component. A union elbow solves this by providing a positive 90-degree change of direction with a full bore, keeping water moving freely while organizing the run inside a cabinet or equipment enclosure. The result is a tidier, more dependable system.

Tidy Right-Angle Turns

• Connection: Tube x Tube, both ends 3/8"
• Union elbow turns the line a clean 90 degrees
• Corrosion-resistant polypropylene construction
• Push-in collets grip and seal each tube automatically
• Tool-free, demountable assembly for easy rework
• Maintains full bore for unrestricted flow

To install, cut both tube ends square and remove any burrs, then push each fully into its port until it seats past the collet. The internal O-rings create watertight seals at both ends, and a gentle tug confirms the grip. Because polypropylene resists corrosion and the chemicals present in treated water, the elbow holds up to continuous service without scaling or rusting. Should you need to reconfigure the layout, depress the collet to release the tube undamaged, then reconnect once the new route is set. This demountable design makes future changes painless as a system grows or is rearranged. For neat, leak-free direction changes in residential water treatment systems, this John Guest union elbow is a dependable, reusable component that keeps tubing runs organized and flowing freely.

Within the John Guest family, this union elbow pairs naturally with the unions, tees, valves, and connectors that use the same collet system, so an entire layout can be built and later reworked from interchangeable parts. Using an elbow instead of forcing a tight bend not only protects flow but also makes a run look professional, with tubing following clean, deliberate paths rather than awkward loops inside a cabinet.