Focus on Corrosion-Resistant Nickel-Plated Model HA-4C，Nickel-Plated M4 Corrosion-Resistant Vent for Marine and Offshore Use

1. Marine-Grade Corrosion Resistance: The substrate is high-quality mild steel with electroless nickel plating (coating thickness ≥5μm). Neutral salt spray (NSS) testing confirms 720 hours of rust-free performance. Compared to stainless steel, nickel plating offers cathodic protection at scratches, effectively inhibiting corrosion propagation—especially valuable for offshore buoys and shipborne radars exposed to persistent high-salt environments.
2. Balanced Airflow Efficiency: At 9ml/min, the airflow strikes an optimal balance between standard and high-flow rates, meeting most outdoor enclosure pressure equalization needs while minimizing moisture ingress—particularly critical in high-humidity marine settings.
3. Comprehensive Chemical Protection: The E-PTFE membrane is not only hydrophobic but also highly resistant to oil and organic solvent permeation. In engine room environments where fuel vapors may be present, the membrane effectively blocks oil vapor entry into control boxes, protecting circuit board contacts from contamination.
4. Standardized Form Factor: With 9.8mm body diameter, 12mm wrench size, and 1.7mm thread length, it is physically interchangeable with the HA-4A-1, allowing flexible selection based on corrosion protection requirements.