GENTLE USD Mini Reducer Union｜6mm to 4mm Step-Down Connector

• Ultra-Compact Size: ~40% smaller / ~20% slimmer for dense layouts in control cabinets, behind-panel routing, rail-side tight slots, jigs/fixtures, and robotic wrists.
• Dual Push-to-Connect, Thread-Free: Both ends are push-in—no threads, no tape. Push fully to lock; ideal for in-cabinet jumpers, module-to-module links, and quick extensions.
• Inline Step-Down Reducer: One-piece 6→4 mm transition replaces “union + separate reducer,” cutting fitting count and leak points.
• Airtight Sealing, Low Pressure Drop: O-ring + metal collet deliver vibration-resistant sealing; a straight bore keeps airflow stable for trunk splices and branch jumpers.
• Taiwan-Made, Dual Colors: Black or grey-white (-GW) options for clean system matching and circuit identification.

Q1: How does USD differ from the US series?
A: US is a same-diameter union, while USD is a reducer union providing an inline 6→4 mm transition to minimize interfaces and potential leak points.

Q2: Typical applications?
A: Step-down branching in automation systems, robotic arms, and compact cabinet routing, plus short jumpers between modules or quick temporary extensions.

Q3: Is any thread sealing required?
A: No. USD is thread-free push-to-connect; insert fully to achieve airtight sealing—no PTFE tape needed.

Q4: Recommended installation steps?
A: Square-cut with a PU tube cutter → push fully to the stop → perform a pull test → leak-test the assembly.

Q5: Is it reusable?
A: Yes, if the O-ring and metal collet remain intact. Re-cut scratched/ovalized tube ends before reinsertion to protect sealing surfaces.