A robust air conditioning system relies on every component working in harmony, and the low‑pressure line is no exception. The WG1642821072-040 Low pressure pipe from HOWO is engineered to deliver consistent refrigerant return flow to the compressor, ensuring optimal cooling performance and system efficiency. As a critical Howo/Sitrak truck parts solution, this pipe is manufactured from high‑quality aluminum with a multi‑layer corrosion‑resistant coating, featuring precision‑formed ends that guarantee a perfect seal with factory O‑rings. Its engineered routing eliminates sharp bends that could restrict flow, while the integrated accumulator ensures proper liquid‑gas separation, protecting the compressor from slugging. Whether you are replacing a damaged line or performing a full AC overhaul, the WG1642821072-040 delivers factory‑grade fit, lasting durability, and trouble‑free operation – making it the trusted choice for workshops and fleet maintenance teams worldwide.
The WG1642821072-040 Low pressure pipe connects the evaporator outlet to the compressor suction port, carrying low‑pressure, low‑temperature refrigerant gas back to the compressor for the next compression cycle. Any restriction, leak, or deformation in this line can cause pressure drops, reduced cooling capacity, and compressor overheating. HOWO has designed this pipe with a smooth internal bore that minimizes flow resistance, and its carefully calculated diameter ensures proper refrigerant velocity to carry oil back to the compressor – a critical factor for compressor lubrication. The pipe’s robust construction resists road debris and vibration fatigue, maintaining system integrity even in the most demanding environments. With the WG1642821072-040, you ensure that your AC compressor receives the correct volume of refrigerant gas, preserving its efficiency and extending its operational life.
Smooth Flow
Minimal Restriction
Leak‑Proof
Precision Seals
OEM Grade
Genuine HOWO
Optimized Routing
Factory Fit
Accurate dimensional and material data ensures proper selection and installation. The WG1642821072-040 is manufactured to strict OEM standards, guaranteeing a seamless replacement for your HOWO air conditioning system.
| Parameter | Specification | Detail |
|---|---|---|
| OEM Number | WG1642821072-040 | Exact Match |
| Part Name | Low pressure pipe | HOWO Genuine |
| Brand | HOWO | Original Equipment |
| Application | HOWO T7H / A7 / Cabin AC | Suction line |
| Material | Aluminum (3003) with anticorrosion coating | Lightweight, durable |
| Tube Diameter | 12.7 mm (1/2″) | Standard size |
| Length (overall) | 1100 mm | End‑to‑end |
| Fitting Type | Block‑style (evaporator) / O‑ring (compressor) | Factory spec |
| Max Working Pressure | 15 bar (217 psi) | Suitable for R134a |
| Operating Temp | -40°C to +120°C | Wide range |
| Warranty | 12 Months | Manufacturer Guarantee |
The WG1642821072-040 is produced using advanced seamless tube drawing technology, ensuring a uniform wall thickness and a perfectly smooth inner surface. This minimizes turbulence and pressure drop, allowing the refrigerant gas to flow freely back to the compressor. The pipe is then precision‑bent using CNC mandrel benders to achieve the exact factory routing, eliminating stress risers and ensuring a drop‑in fit.
Both ends are finished with precision‑machined fitting surfaces – one side features a block‑style connection with an integrated O‑ring groove for the evaporator, while the other uses a standard flare or O‑ring fitting for the compressor. A multi‑layer anticorrosion coating is applied to protect against road salts, moisture, and chemical attack. Each pipe undergoes a 100% pressure test to verify leak integrity, and the fitting threads are checked for dimensional compliance. This meticulous engineering guarantees that the WG1642821072-040 will deliver reliable, leak‑free service for the life of your vehicle.
The WG1642821072-040 is specifically designed for HOWO heavy‑duty trucks, including T7H, A7, and derivative models with factory air conditioning. It directly replaces the original low‑pressure suction line, with identical routing and connection points. The pipe is designed to accommodate the factory mounting clips and protective sleeves, ensuring a clean and secure installation without modifications.
This pipe is also compatible with many Sinotruk and other commercial vehicles that share the same AC system layout. To confirm fitment, always cross‑reference the OEM number on your existing line with WG1642821072-040. If they match, this component will integrate seamlessly. Keeping this pipe in your spare parts inventory allows for rapid AC repairs, minimising downtime and ensuring driver comfort during hot weather.
HOWO T7H
Primary Fitment
HOWO A7
Also Compatible
AC Suction Line
Direct Route
Direct Replacement
No Mods
Replacing a damaged or leaking low‑pressure line with the WG1642821072-040 restores the efficiency of your entire AC system. The smooth internal bore and proper diameter ensure that refrigerant returns to the compressor at the correct pressure and velocity, improving cooling capacity and reducing compressor work. The leak‑proof seals eliminate the risk of refrigerant loss, which not only reduces cooling performance but also harms the environment.
The optimized routing also minimizes the risk of chafing against other components, reducing the potential for future wear. For fleet operators, a reliable low‑pressure line reduces AC‑related breakdowns and service calls, keeping drivers comfortable and focused on the road. By investing in the WG1642821072-040, you ensure that your air conditioning system performs at its best, providing consistent cool air in even the most demanding conditions.
Installing the WG1642821072-040 Low pressure pipe is a moderate‑skill task. Begin by safely recovering the refrigerant from the AC system. Disconnect the negative battery cable. Locate the old pipe and remove any mounting clips. Carefully loosen the fittings at both ends, noting the orientation and any sealing washers.
Remove the old pipe and clean the connection points. Lubricate the new O‑rings with fresh PAG oil and install them on the new pipe fittings. Route the new pipe exactly as the old one, securing it with the original clips. Tighten the fittings to the manufacturer’s specified torque (typically 15‑20 Nm for aluminum fittings). Evacuate the system to remove air and moisture, then recharge with the specified refrigerant. Start the engine and test the AC operation, checking for any leaks with a leak detector. With careful installation, the WG1642821072-040 will provide a lifetime of leak‑free service.
Pro Tip: Always replace the O‑rings at both ends when installing a new pipe. Old O‑rings can harden and fail, causing leaks. The WG1642821072-040 does not come with O‑rings, so order them separately to ensure a perfect seal.
Genuine HOWO components are engineered to the highest standards, and the WG1642821072-040 Low pressure pipe is no exception. Aftermarket pipes often use thinner aluminum, lack proper anticorrosion coatings, or have imprecise bends that cause stress and early failure. HOWO’s pipe is manufactured using the same materials and processes as the original equipment, guaranteeing a perfect fit and reliable performance.
By choosing the WG1642821072-040, you benefit from HOWO’s extensive validation, including pressure cycling, thermal shock, and vibration testing. This ensures that the pipe can withstand the harsh conditions of heavy‑duty trucking. Moreover, genuine parts are backed by a comprehensive warranty and supported by HOWO’s global network, giving you confidence in your purchase.
OEM Authentic
Factory Quality
Long Service
Extended Life
Global Standard
Trusted Worldwide
Q: Which vehicles use the WG1642821072-040?
A: It is designed for HOWO T7H, A7, and other models with factory AC, as well as many Sinotruk trucks with the same suction line configuration.
Q: What are the signs of a failing low‑pressure pipe?
A: Reduced cooling performance, visible oil stains or dye traces, hissing sounds, and a gradual loss of refrigerant are common indicators.
Q: Can I repair a damaged pipe instead of replacing it?
A: Minor abrasions may be protected with sleeving, but any leak or kink requires replacement. The WG1642821072-040 is the only reliable solution for permanent repair.
Q: How do I confirm the correct part?
A: Check the OEM number stamped on your existing pipe. If it matches WG1642821072-040, this is the exact replacement. Consult your vehicle’s parts manual for verification.
Order your WG1642821072-040 Low Pressure Pipe today! Explore our complete selection of genuine HOWO and Sinotruk AC components at Howo/Sitrak truck parts and keep your cabin cool and comfortable.
The WG1642821072-040 Low Pressure Pipe from HOWO is a testament to precision engineering and durable construction. By choosing this genuine component, you ensure that your air conditioning system operates at peak efficiency, providing consistent cool air and protecting your compressor from damage. Whether you are a professional mechanic or a fleet manager, this pipe offers the reliability and exact fit required for modern heavy‑duty trucks. Trust HOWO – the benchmark for excellence in heavy‑duty truck components – and experience the difference that genuine quality makes.
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