Professional Underbody and Cavity Application Tool
NHOU® Professional Undercoating Spray Gun – 500mm Application Tube
A lightweight compressed-air spray gun with an extended 500mm application tube and metal feed cup for controlled rustproofing of underbodies, cavities and difficult-to-reach vehicle areas.
The NHOU® Professional Undercoating Spray Gun is engineered for the controlled application of compatible oil-based rustproofing materials and underbody coatings.
Its extended 500mm application tube provides additional reach beneath vehicles and inside accessible chassis areas, while the aluminium feed cup allows coating material to be poured, mixed and refilled during professional workshop applications.
Key Benefits
Extended 500mm Reach
Provides improved access beneath vehicles and into suitable recessed or difficult-to-reach treatment areas.
Professional Undercoating Use
Designed for compatible rustproofing oils, underbody coatings and corrosion-prevention materials.
Metal Feed Cup
The aluminium cup supports convenient filling and repeated professional application work.
Lightweight Construction
An approximate weight of 0.50kg helps reduce fatigue during longer treatment sessions.
Corrosion-Resistant Components
Nickel-plated, zinc-plated and stainless-steel parts support durability in demanding workshop environments.
Controlled Pneumatic Application
Provides direct compressed-air delivery for consistent application of suitable coating materials.
Official NHOU® Distributor in Europe
Carlat.com is an official NHOU® distributor in Europe, recognised by the manufacturer.
We supply genuine NHOU® corrosion-protection products and professional application equipment to workshops, fleet operators, businesses and experienced private users throughout Europe.
Recommended Applications
This spray gun is suitable for professional and experienced DIY rustproofing work requiring controlled application and extended reach.
- Vehicle underbody treatment
- Chassis and frame sections
- Wheel arches and wheel wells
- Crossmembers and brackets
- Seams and recessed areas
- Professional rustproofing workshops
- Fleet-maintenance operations
- Vehicle restoration projects
- Commercial and utility vehicles
- Experienced DIY applications
Extended Application Tube
The approximately 500mm tube extends the spray outlet away from the gun body, helping the operator reach beneath chassis members, around suspension structures and into suitable accessible vehicle sections.
- Improved access beneath raised vehicles
- More convenient application around chassis structures
- Reduced need to position the gun body close to the surface
- Suitable for controlled underbody coating work
Application limitation: The straight 500mm tube improves reach but is not a flexible 360-degree cavity probe. Fully enclosed cavities may require a dedicated flexible hose and cavity nozzle.
Durable Workshop Construction
The spray gun combines aluminium, brass, plated steel, stainless steel and chemical-resistant sealing materials selected for repeated professional use and straightforward maintenance.
| Gun body | Nickel-plated die-cast aluminium |
| Internal air nozzle | Carbonitrided and zinc-plated steel |
| External nozzle | Nickel-plated brass, CW614N |
| Lever | Nickel-plated steel |
| Rivet | Zinc-plated steel |
| Valve | Ultraform® N2320 resin and brass |
| Spring | AISI 302 stainless steel |
| Seals | NBR 70 |
| Suction pipe | Zinc-plated steel |
| Feed cup | Aluminium alloy |
Technical Specifications
| Product | NHOU® Professional Undercoating Spray Gun |
| Application tube length | Approximately 500mm |
| Power supply | Compressed air |
| Maximum pressure | 8 bar |
| Operating temperature | –10°C to +90°C |
| Air connection | 1/4" female BSP cylindrical thread |
| Approximate weight | 0.50kg |
| Feed system | Metal suction feed cup |
| Primary application | Compatible oil-based undercoating and rustproofing materials |
What Is Included?
- 1 × NHOU® professional compressed-air undercoating spray gun
- 1 × Approximately 500mm rigid application tube
- 1 × Aluminium suction feed cup
- 1 × Installed nozzle and valve assembly
- 1 × Instruction manual, where supplied by the manufacturer
Setup and Application Guide
- Read the instructions: Review the spray-gun manual and coating manufacturer’s directions before use.
- Confirm compatibility: Verify that the selected rustproofing or underbody coating is suitable for the gun, cup, seals and nozzle.
- Prepare the coating: Mix or condition the product according to its label instructions.
- Fill the feed cup: Add the required quantity without exceeding the permitted fill level.
- Connect the air supply: Attach a suitable regulated compressor using compatible hoses and fittings.
- Test the application: Use a test panel to verify material flow, spray pattern and pressure before treating the vehicle.
- Apply evenly: Maintain a stable distance and move the tube in smooth, controlled passes.
- Protect surrounding parts: Avoid brakes, friction surfaces, tyres, exhaust components, belts and areas where an oil coating is unsuitable.
- Depressurise safely: Disconnect the air supply and release stored pressure before cleaning or adjustment.
- Clean immediately: Empty and clean the cup, suction pipe, tube and nozzle using a cleaner approved for the applied material.
Pressure warning: Never exceed 8 bar. Use a regulated air supply and inspect the gun, cup, tube, seals and fittings before every application.
Frequently Asked Questions
What is the 500mm tube used for?
It provides additional reach for applying undercoating beneath vehicles, around chassis structures and in suitable recessed areas.
Is the 500mm tube flexible?
No. It is a rigid extended application tube. Fully enclosed cavities may require a separate flexible cavity hose and nozzle.
Does the gun include a material container?
Yes. It includes a metal suction feed cup for compatible undercoating and rustproofing materials.
Is an air compressor included?
No. A compatible regulated air compressor, hose and connection fittings are required separately.
What is the maximum permitted pressure?
The specified maximum pressure is 8 bar. The actual working pressure should be selected according to the coating and application instructions.
Is it suitable for NHOU® rustproofing products?
It is intended for compatible NHOU® oil-based rustproofing and undercoating products. Confirm viscosity and equipment compatibility before application.
Can the gun be used with highly viscous paste-like compounds?
Only use materials approved for this gun and nozzle configuration. Very thick paste-like compounds may require specialist high-viscosity application equipment.
How should the gun be cleaned?
Depressurise the system, empty the cup and clean all material-contact components immediately using a cleaner approved for the applied coating.
Is this tool suitable for beginners?
It is intended for professional and experienced DIY use. Operators should understand compressed-air equipment, coating compatibility, masking and safe spray application.
Safety Information
Read the spray-gun instructions and coating Safety Data Sheet before use. Wear suitable gloves, eye protection, protective clothing and respiratory protection where required. Never exceed the maximum pressure, never direct the gun toward people or animals, and always depressurise the equipment before cleaning, maintenance or disassembly.
Extended Reach for Professional Underbody Treatment
The NHOU® Professional Undercoating Spray Gun combines a 500mm application tube, metal feed cup and durable compressed-air construction for controlled rustproofing of underbodies and difficult-to-reach vehicle areas. Order professional NHOU® equipment from Carlat.com, the official NHOU® distributor in Europe.