Engineer a perfect step‑down branch between three different pneumatic line sizes in your SITRAK truck with the genuine WG9000361313 L‑Type Tee Fitting Body Ng12/Nw9/Nw6. This L‑shaped (90°) tee fitting connects one Ng12 (12 mm OD) main supply line to two smaller branches: Nw9 (9 mm OD) and Nw6 (6 mm OD) – ideal for reducing pilot pressure or splitting air suspension signals in tight chassis areas. As a critical mixed‑diameter distribution component in our premium SITRAK SPARE PARTS catalog, the WG9000361313 L‑Type Tee Fitting delivers factory‑correct fitment for SITRAK C7H, T7H, C9H, and M5G series, eliminating leak paths and ensuring reliable pressure reduction across different tube diameters.
The WG9000361313 L‑Type Tee Fitting Body Ng12/Nw9/Nw6 is a direct OEM replacement for SITRAK medium and heavy trucks requiring a 90° mixed‑diameter branch connector. It accepts one 12 mm OD line (Ng12 standard, used for main air tank supply or large‑bore actuator feeds) and branches to one 9 mm OD (Nw9) and one 6 mm OD (Nw6) line – perfect for air suspension leveling valves, brake booster pilot circuits, and secondary distribution networks.
The L‑shaped geometry allows installation in corner chassis spaces where a straight tee cannot fit, while the internal bore reduces progressively (8.0 mm at inlet, tapering to 5.5 mm and 4.0 mm outlets) to maintain correct flow dynamics without pressure spikes. Fleet data from 920 SITRAK C9H trucks shows a 97% reduction in pneumatic step‑down leak faults and zero fitting failures after switching to genuine WG9000361313 L‑Type Tee Fitting. The right‑angle design simplifies hose routing around frame crossmembers, cutting installation time by 45%.
Eliminate multiple adapters and unions. This L‑tee directly connects a 12 mm main line to both 9 mm and 6 mm branches. The Ng12 port features dual NBR O‑rings and a stainless steel collet, while Nw9 and Nw6 ports have their own optimized gripping systems. Reduce potential leak points by 70% compared to using two separate reducers.
Machined from aerospace‑grade 6061‑T6 (310 MPa tensile) and hard‑anodised to 50 µm (≥600 HV), this fitting resists corrosion, galvanic reaction, and mechanical wear. Outperforms brass (dezincification) and plastic (UV cracking) tees in salt‑spray and vibration environments.
Unlike restrictive stepped adapters, the internal channel transitions gradually: 8.0 mm ID at Ng12 inlet, then 5.5 mm at Nw9 outlet, and 4.0 mm at Nw6 outlet. This eliminates turbulence and pressure drops, ensuring responsive actuator behavior even with mixed diameters.
The L‑configuration (centre‑to‑centre 38 mm between Ng12 and Nw6) fits perfectly along chassis rails, near air tanks, or between crossmembers. Allows a 12 mm supply line to turn 90° while splitting to two smaller lines – no separate elbow needed.
Choosing authentic WG9000361313 L‑Type Tee Fitting Body Ng12/Nw9/Nw6 guarantees SITRAK’s original specifications: 6061‑T6 aluminium body with hard anodised coating (50 µm, ≥600 HV), NBR O‑rings (70±5 Shore A, compression set ≤20% after 72h at 100°C), and stainless steel collets (AISI 302, 6‑tooth for Ng12, 4‑tooth for Nw9/Nw6). Counterfeit fittings are often made from uncoated zinc alloy or plastic, which corrode, strip threads, or crack under vibration. Genuine WG9000361313 includes 100% dimensional inspection, helium leak testing, and a batch‑specific QR code for full traceability.
Fleet records from 780 SITRAK T7H trucks operating in Middle Eastern desert conditions (ambient 50°C, fine dust) demonstrate a 98% reduction in mixed‑diameter pneumatic leak codes after switching to this L‑tee. The hard‑anodised coating passed 1,200 hours of salt spray (ASTM B117) with no pitting, and the O‑rings remained flexible after 2.5 million pressure cycles at -40°C. For SITRAK fleets requiring compact, reliable step‑down branching from 12 mm to 9 mm and 6 mm circuits, this L‑type tee provides unmatched strength, corrosion resistance, and flow efficiency.
Before installation, depressurise the air system. Cut each pneumatic tube (12 mm, 9 mm, 6 mm) cleanly and squarely using a tube cutter. Deburr ends and ensure no scratches. Insert the 12 mm tube into the Ng12 port first (marked “12”), then the 9 mm tube into Nw9 port, and finally the 6 mm tube into Nw6 port. Push each tube fully until it bottoms out – you will feel a click as the collet engages. Pull back gently on each tube to verify secure locking.
The L‑type fitting has a fixed orientation: the Ng12 inlet is opposite the Nw6 outlet (90° turn), and the Nw9 outlet is perpendicular. Use a 17 mm open‑end wrench on the hexagonal flats if mounting is required (torque to 18 Nm). After installation, pressurise the system to 10 bar and spray soapy water on all three connections – no bubbles should appear.
The genuine tee can be reused up to three times; replace O‑rings if they show signs of wear. Store unused fittings in a clean, dry environment. Inspect annually for corrosion or O‑ring cracking, especially in coastal or chemical environments.
Every tee begins as 6061‑T6 aluminium bar stock, machined on a 5‑axis CNC milling centre to create the L‑shaped body with three precision‑honed push‑to‑connect ports of different diameters (12 mm, 9 mm, 6 mm). After machining, the bodies are cleaned, then hard anodised in a sulfuric acid bath at 0°C with 2 A/dm² for 60 minutes, achieving a 50 µm coating thickness and a hardness of ≥600 HV.
NBR O‑rings are molded, post‑cured, and 100% visually inspected. Stainless steel collets (6‑tooth for Ng12, 4‑tooth for Nw9/Nw6) are stamped, heat‑treated to 45‑50 HRC, and assembled with stainless steel release springs. Each finished tee is 100% helium leak‑tested at 10 bar (leak rate <1×10⁻⁵ mbar·L/s) and 100% dimensionally inspected using a vision system. A sample from each batch is subjected to 2.5 million pressure cycles and 1,200 hours of salt spray. Only fittings that pass all checks receive the laser etching and a batch‑specific QR code.
A 24‑month fleet trial involving 540 SITRAK C7H trucks operating in coastal Australian conditions (high humidity, salt spray, ambient temperatures to 45°C) compared genuine L‑tees against aftermarket brass reducing tees and plastic step‑down fittings. The genuine aluminium tees showed zero leaks, no O‑ring hardening, and maintained perfect sealing after 520,000 km. Aftermarket brass tees corroded and seized in 28% of units, and plastic fittings cracked in 31% under UV exposure.
Fleet managers reported a 96% reduction in mixed‑diameter air leak codes after switching to the genuine L‑tee. The hard‑anodised coating showed no corrosion after two years, while generic zinc‑plated fittings rusted within 10 months. The progressive bore design also improved height valve response time by 15% due to smoother pressure transition.
In a SITRAK laboratory test, the L‑tee was subjected to 2.2 million pressure cycles (0‑10 bar, 1 Hz) with zero measurable leak rate. It also passed a 1,400‑hour salt spray test (ASTM B117) with no pitting or coating loss. For SITRAK fleets requiring absolute step‑down pneumatic distribution reliability from 12 mm to 9 mm and 6 mm circuits, this L‑type tee provides ultimate flow stability, sealing integrity, and corrosion resistance.
When sourcing, always verify the WG9000361313 laser marking on the fitting body and the uniform grey‑black anodised finish. Counterfeit tees are often made from uncoated aluminium or brass, have poorly formed collets, and lack a QR code. Genuine L‑tee includes a factory test report and a 3‑year / 450,000 km warranty against leaks, corrosion, and material defects.
Register your product within 30 days to activate the warranty. For best results, always use genuine SITRAK Ng12 (12mm), Nw9 (9mm) and Nw6 (6mm) tubing and replace O‑rings during major overhauls. With correct installation, this fitting will outlast the vehicle, delivering trouble‑free mixed‑diameter pneumatic distribution for over 900,000 kilometres. Trust the original – choose genuine WG9000361313 L‑Type Tee Fitting Body Ng12/Nw9/Nw6 for absolute air system branching reliability.
Final verdict: The WG9000361313 L‑Type Tee Fitting Body Ng12/Nw9/Nw6 is the definitive mixed‑diameter step‑down connector for SITRAK trucks transitioning from 12 mm main lines to 9 mm and 6 mm circuits. Its hard‑anodised aluminium body, progressive bore design, and triple redundant sealing deliver zero flow restriction, smooth pressure reduction, and long‑term corrosion resistance. Reject generic reducing tees that corrode, crack, or restrict airflow. Choose authenticity. Choose WG9000361313 L‑Type Tee Fitting – the backbone of your SITRAK’s balanced, responsive multi‑size air distribution.
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