4 Inch 1.5mm Thick Stainless Exhaust Rain Cap with Silicone Seal Flapper Exhaust Flapper Cap for Truck Generator Stack

Made of premium SUS304 stainless steel, this exhaust rain cap delivers outstanding rust and salt spray resistance, excellent high-temperature tolerance, and stable mechanical performance — suitable for long-term outdoor and coastal working conditions. It features simple clamp-on installation, firm fixation, and a low failure rate, greatly extending the service life of exhaust and muffler assemblies while cutting maintenance costs.

Multiple inch sizes are available for selection, and custom service is acceptable.

• Clamp-on installation — no welding required
• Fits vertical exhaust stacks for generators, trucks, and tractors
• Multiple inch sizes available; custom sizes supported
• Brand new construction with stable performance for outdoor heavy-duty use

The sealed flapper version of the 4 inch exhaust rain cap is specified where water ingress causes real damage. It is commonly purchased for:

1. Trucks operating in snow and road-salt conditions
2. Vehicles washed daily in depots with high-pressure equipment
3. Cold-store and refrigerated transport fleets
4. Any stack where condensate has previously reached the muffler